| Titulo | Fecha | Proveedor | Acceso | Cambio de titulo |
| OPERA Observatorio de Políticas Ejecución y Resultados de la Administración Pública | 2001- | Dialnet | . | . |
| Opera slavica | 1991- | Masaryk University | . | . |
| Operational Research in Engineering Sciences: Theory and Applications | 2018- | Regional Association for Security and crisis management, Belgrade, Serbia | . | . |
| Operations and Supply Chain Management | 2022- | Sepuluh Nopember Institute of Technology | . | . |
| Operations research and decisions | 2010- | Wrocław University of Technology | . | . |
| Operations Research Perspectives | 2014- | Elsevier Science | . | . |
| Operative dentistry | 1976- excepto últimos 36 meses | Allen Press | . | Cambio de: Journal of the American Academy of Gold Foil Operators |
| Operative Neurosurgery | 2017- excepto últimos 12 meses | PubMed Central | Artículos selectos | . |
| Operative Techniques in Thoracic and Cardiovascular Surgery | 1998- excepto últimos 24 meses | Elsevier Science | . | Cambio de: Operative Techniques in Cardiac and Thoracic Surgery |
| Õpetatud Eesti Seltsi Aastaraamat Yearbook of the Learned Estonian Society | 2010- | Õpetatud Eesti Selts | . | . |
| Ophthalmic hospital reports and journal of the Royal London Ophthalmic Hospital | 1857-1859 | Wellcome Library | . | . |
| Ophthalmic Research | 2007-2012 | PubMed Central | Artículos selectos | . |
| Ophthalmic Research | 2021- | Karger Publishers | . | . |
| Ophthalmologica Extra | 2014- | Karger Publishers | . | . |
| Ophthalmologica International Journal of Ophthalmology | 2009-2009 | PubMed Central | Artículos selectos | . |
| Ophthalmology 1816 5095 | 2012- | Ophthalmology Publishing Group | . | . |
| Ophthalmology and Eye Diseases | 2009-2017 | Sage Journals | . | Cambio a: Therapeutic advances in ophthalmology |
| Ophthalmology and Eye Diseases | 2009-2017 | PubMed Central | . | Cambio a: Therapeutic advances in ophthalmology |
| Ophthalmology and Therapy | 2012- | Springer | . | . |
| Ophthalmology and Therapy | 2012- | PubMed Central | . | . |
| Ophthalmology Journal | 2016- | Via Medica | . | . |
| Ophthalmology Science | 2021- | Elsevier Science | . | . |
| Ophthalmology Science | 2021- | PubMed Central | . | . |
| Ophthalmology Times | 2001- | Advanstar Communications Ltd. | . | . |
| Opinião Pública | 2000- | SciELO (Brasil) | . | . |
| Opinião Pública | 2000- | Red ALyC | . | . |
| Opinião Pública | 1993- | UNICAMP | . | . |
| Opinion Armed Forces War College | 2013-2015 | National Defence University | . | . |
| Opinión Barcelona | 2008- | CIDOB | . | . |
| Opinión del país La La Coruña 1896 | 1896 | Galiciana | . | . |
| Opinión gallega | 1945-1953 | Galiciana | . | . |
| Opinión gallegista | 1934-1935 | Galiciana | . | . |
| Opinion La diario de Pontevedra | 1896-1897 | Galiciana | . | . |
| Opinion La semanario independiente | 1911 | Galiciana | . | . |
| Opìr Materìalìv ì Teorìâ Sporud | 2009- | Kyiv National University of Construction and Architecture | . | . |
| Opisthobranch | 1984-1984 | BioDiversity Heritage Library | . | . |
| Opisthobranch newsletter | 1969-1983 | BioDiversity Heritage Library | . | . |
| Opolis An International Journal of Suburban and Metropolitan Studies | 2004-2006 | University of California | . | . |
| Opolskie Studia Administracyjno-Prawne | 2016- | Wydawnictwo Uniwersytetu Opolskiego | . | . |
| OPSI | 2016- | Universitas Pembangunan Nasional 'Veteran' Yogyakarta | . | . |
| OPSIS Revista do Departamento de História e Ciências Sociais | 2001- | Universidade Federal de Goiás | . | . |
| Optica | 2014- | Optica Publishing Group | . | . |
| Optica Applicata | 1971- | Wroclaw University of Technology | . | . |
| Óptica Pura y Aplicada | 1990- | Sociedad Española de Optica - Sedoptica | . | . |
| Optica Quantum | 2023- | Optica Publishing Group | . | . |
| Optical Data Processing and Storage | 2015- | de Gruyter | . | . |
| Optical Materials Express | 2011- | Optica Publishing Group | . | . |
| Optical Materials X | 2019- | Elsevier Science | . | . |
| Optical Nanoscopy | 2012-2014 | SpringerOpen | . | . |
| Optical Review | 1994-1999 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Opticon1826 | 2006-2015 | University College London | . | . |
| Optics | 2020- | MDPI AG | . | . |
| Optics and Photonics Journal | 2011- | Scientific Research Publishing | . | . |
| Optics and Photonics Letters | 2008- | World Scientific Publishing Company | . | . |
| Optics Continuum | 2022- | Optica Publishing Group | . | Cambio de: OSA Continuum |
| Optics Express | 2009- excepto últimos 12 meses | PubMed Central | Artículos selectos | . |
| Optics Express | 1997- | Optica Publishing Group | . | . |
| Optik & Photonik | 2006-2018 | Wiley Online Library | . | . |
| Optima Newsletter | 1996-2015 | OPTIMA - Organization for the Phyto-Taxonomic Investigation of the | . | . |
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| Opto and Laser Europe | 2001- | Optics | . | . |
| Opto Electronic Advances | 2021- | Institue of Optics and Electronics, Chinese Academy of Sciences | . | . |
| Opto-Electronic Science | 2022- | Editorial Office of Opto-Electronic Journals, Institute of Optics and Electronics, CAS, China | . | . |
| Opto-Electronics Review | 1992-2005 | Polish Academy of Sciences | . | . |
| Opto-Electronics Review | 2015- | Polish Academy of Sciences | . | . |
| Optoelectronics and Advanced Materials-Rapid Communications | 2007- | National Institute of Optoelectronics | . | . |
| Optofluidics Microfluidics and Nanofluidics | 2014- | de Gruyter | . | Cambio de: Optofluidics |
| Optogenetics | 2013-2013 | Portico | . | . |
| Optometria clinica y ciencias de la vision | 2022- | Sociedad Aragonesa de Optometría y Contactología | . | . |
| Optometric Education | 2008- | Association of Schools and Colleges of Optometry | . | . |
| Optometry & Vision Development | 2005-2012 | College of Optometrists in Vision Development | . | . |
| Optometry & Vision Science | 1989- excepto últimos 12 meses | Lippincott Williams & Wilkins | . | . |
| Optometry & Visual Performance | 2013- | Optometric Extension Program Foundation | . | . |
| Optometry Reports | 2011-2016 | PAGEPress | . | . |
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| Opuscula Annual of the Swedish Institutes at Athens and Rome | 2008- | Svenska institutet I Athen | . | . |
| Opuscula Mathematica | 2004- | AGH University of Science and Technology | . | . |
| Opuscula Musealia | 2010- | Wydawnictwo Uniwersytetu Jagiellonskiego | . | . |
| Opuscula Philolichenum | 2004- | New York Botanical Garden | . | . |
| Opuscula Short texts of the Middle Ages and Renaissance | 2011- | University of Calgary | . | . |
| Opuscula Theologica et Scientifica | 2023- | John Wesley Theological College | . | . |
| Opuscula zoologica | 1957-1975 | BioDiversity Heritage Library | . | . |
| Opuscula Zoologica Instituti Zoosystematici et Oecologici Universitatis Budapestinensis | 2001- | Eötvös Loránd University | . | . |
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| Oral | 1999- | Imbiomed | Registro individual requerido | . |
| Oral | 2006- | Medigraphic | . | . |
| Oral & Implantology | 2008-2017 | PubMed Central | . | . |
| Oral & Implantology | 2008- | CIC Edizioni Internazionali | . | . |
| Oral & Maxillofacial Pathology Journal | 2010- | Kairali Society of Oral & Maxillofacial Pathologists | . | . |
| Oral — Health, Diseases, Therapies, and Technologies | 2021- | MDPI AG | . | . |
| Oral and Maxillofacial Surgery Cases | 2015- | Elsevier Science | . | . |
| Oral Health | 2000- | Business Information Group | . | . |
| Oral Health & Preventive Dentistry | 2003- | Quintessenz Verlags-GmbH | . | . |
| Oral Health and Dental Management | 2002- | Informedica | . | . |
| Oral Health Research and Clinical Evidence | 2024- | MedKnow | . | . |
| Oral History Forum | 1975- | Canadian Oral History Association | . | . |
| Oral Medicine & Pathology | 1996-2012 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Oral Oncology Extra | 2004-2006 | Elsevier Science | . | . |
| Oral Oncology Reports | 2022- | Elsevier Science | . | . |
| Oral Science International | 2004-2010 | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Oral Science International | 2004-2018 | Elsevier Science | . | . |
| Oral Sciences | 2005- | Universidade Católica de Brasilia | . | . |
| Oral Therapeutics And Pharmacology | 1982- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | selecciones disponibles | . |
| Oral Tradition | 1986- | Center for Studies in Oral Tradition | . | Cambio a: eOT: Oral Tradition |
| Oralidad | 1988-2011 | UNESCO | . | . |
| Oralidad-es | 2015- | Red Iberoamericana de Estudios de la Oralidad | . | . |
| Orapuh Journal Journal of Oral & Public Health | 2020- | Orapuh, Inc. | . | . |
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| Orapuh Literature Review | 2021- | AJOL | . | . |
| Orbeliani Law Review | 2022- | Sulkhan-Saba orbeliani University | . | . |
| Orbicom Newsletter | 2004- | United Nations Educational, Scientific, and Cultural Organization | . | . |
| Orbis Business | 2013- | Universidad Continental | . | . |
| Orbis Idearum | 2013- | Jagiellonian University History of Ideas Research Centre | . | . |
| Orbis linguarum | 1998- | CEEOL | . | . |
| Orbis Scholae | 2006- | Univerzita Karlova v Praze | . | . |
| Orbis Tertius Revista de teoría y crítica literaria | 1996- | Universidad Nacional de la Plata | . | . |
| Orbis Tertius UPAL - Revista Académica y Científica de la Universidad Privada Abierta Latinoamericana | 2017- | Universidad Privada Abierta Latinoamericana | . | . |
| Orbis. Revista Científica Ciencias Humanas | 2005- | Dialnet | . | . |
| Orbis. Revista Científica Ciencias Humanas | 2005- | Red ALyC | . | . |
| Orbit : Writing Around Pynchon | 2012- | Ubiquity Press | . | . |
| Orbit A Journal of American Literature | 2012- | Open Library of Humanities | . | . |
| Orbit Journal | 2017-2019 | Elsevier Science | . | Cambio a: Journal of Responsible Technology |
| Orbit University of Sydney Undergraduate Research Journal | 2009- | University of Sydney | . | . |
| ORBITA: Jurnal Kajian, Inovasi, dan Aplikasi Pendidikan Fisika | 2017- | Universitas Muhammadiyah Mataram | . | . |
| Orbital The Electronic Journal of Chemistry | 2009- | Universidade Federal de Mato Grosso do Sul | . | . |
| Orbith: Majalah Ilmiah Pengembangan Rekayasa dan Sosial | 2014- | Politeknik Negeri Semarang | . | . |
| Orchadian The | 1963-2015 | BioDiversity Heritage Library | . | . |
| Orchard and farm | 1922-1924 | BioDiversity Heritage Library | . | . |
| Orchard and garden | 1889-1891 | BioDiversity Heritage Library | . | . |
| Orchid Academia Siraha | 2022- | Nepal Journals Online | . | . |
| Orchid album : | 1882-1897 | BioDiversity Heritage Library | . | . |
| Orchid Research Newsletter | 1998- | Royal Botanical Gardens, Kew | . | . |
| Orchid review | 1893-1923 | BioDiversity Heritage Library | . | . |
| Orchid Science and Biotechnology | 2007-2007 | Global Science Books | . | . |
| Orchid world. A monthly illustrated journal entirely devoted to orchidology | 1910-1916 | BioDiversity Heritage Library | . | . |
| Orchidophile; journal des amateurs d'orchideés | 1881-1892 | BioDiversity Heritage Library | . | . |
| Orchis Monatsschrift der Deutschen Gesellschaft für Orchideenkunde | 1906-1920 | Botanicus | . | . |
| Orchis Monatsschrift der Deutschen Gesellschaft für Orchideenkunde | 1906-1920 | BioDiversity Heritage Library | . | . |
| Orð og Tunga | 2015- | Árni Magnússon Institute for Icelandic Studies | . | . |
| Ordenanzas municipales para la ciudad de Monforte y su término municipal | 1897 | Galiciana | . | . |
| Ordentliche wochentliche Kayserl Reichs Ober Post Amts Zeitung In Franckfurt am Mayn | 1750-1750 | Gottinger Digitalisierungs-Zentrum | . | . |
| Ordit L' l'anuari del CREM | 2007- | RACO | . | . |
| Ore Bin | 1939-1978 | Oregon Department of Geology and Mineral Industries | . | Cambio a: Oregon Geology |
| Ore Geology Reviews | 2022- | Elsevier Science | . | . |
| Oregon flora newsletter | 1995-2012 | BioDiversity Heritage Library | . | . |
| Oregon Geology | 1979- | Oregon Deparment of Geology and Mineral Industries | . | Cambio de: Ore Bin |
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| Oregon's Agricultural Progress | 1996- | Oregon State University Extension and Experiment Station | . | . |
| Orensano periódico gallego | 1944-1945 | Galiciana | . | . |
| Orfeu | 2016- | Universidade do Estado de Santa Catarina | . | . |
| Org & Demo | 2000- | Universidade Estadual Paulista (UNESP) | . | . |
| Organ alternatives | 1998-2004 | OrgAt.com | . | . |
| Organ Biology | 2011- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Organ Medicine | 2024- | Wiley Online Library | . | . |
| Organelles Proteomics | 2014-2014 | Portico | . | . |
| Organic and Medicinal Chemistry Letters | 2011-2014 | PubMed Central | . | . |
| Organic and Medicinal Chemistry Letters | 2011-2014 | SpringerOpen | . | . |
| Organic Chemistry Frontiers | 2013- | Royal Society of Chemistry | . | . |
| Organic Chemistry Insights | 2008- | CLOCKSS | . | . |
| Organic Chemistry International | 2008-2016 | Hindawi Publishing Corporation | . | . |
| Organic Communications | 2008- | ACG Publications | . | . |
| Organic Farming | 2015- | Librelloph | . | . |
| Organic Materials | 2019- | Thieme | . | . |
| Organic Photonics and Photovoltaics | 2013- | de Gruyter | . | . |
| Organic Syntheses | 1921- | CambridgeSoft | . | . |
| Organicom | 2004- | Universidade de São Paulo (USP) | . | . |
| Organics | 2020- | MDPI AG | . | . |
| Organisation and activity of the I.R. Agricultural society of Vienna | 1913-1913 | BioDiversity Heritage Library | . | . |
| Organisational Project Management | 2014-2016 | UTSePress | . | . |
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| Organisms Journal of Biological Sciences | 2017- | Sapienza Università di Roma | . | . |
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| Organizações & Sociedade | 2005- | Red ALyC | . | . |
| Organizações e Sustentabilidade | 2013- | Universidade Estadual de Londrina | . | . |
| Organizações Rurais e Agroindustriais | 1996- | Universidade Federal de Lavras | . | . |
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| Organizações Rurais e Agroindustriais | 2000- | University of Minnesota Libraries | . | . |
| Organization and Management | 2010- | Polska Akademia Nauk | . | . |
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| Organizational Behavior Studies Quarterly | 2013- | Academy of Orgazational Behavior Managment | . | . |
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| Organizational Economics Proceedings | 2012- | University of Sydney | . | . |
| Organizational Science | 2012- excepto últimos 12 meses | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | . | . |
| Organizations & Markets in Emerging Economies | 2010- | CEEOL | . | . |
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| Organogenesis | 2004- | Taylor & Francis | . | . |
| Organogenesis | 2004- | PubMed Central | . | . |
| Organoid | 2021- | The Organoid Society | . | . |
| Organoid Research | 2025- | ACC Science Publishing | . | . |
| Organoids | 2022- | MDPI AG | . | . |
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| Organon F International journal of analytic philosophy | 1994-2018 | Filosofický ústav Akademie věd České republiky | . | . |
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| Orinoquia | 2003- | Universidad de Los Llanos | . | . |
| oriole : official organ of the Somerset Hills Bird Club | 1914-1915 | BioDiversity Heritage Library | . | . |
| Oriole The Quarterly Journal of the Georgia Ornithological Society | 2005-2013 | SORA | . | . |
| Oriole The Quarterly Journal of the Georgia Ornithological Society | 1936-2006 | Georgia Ornithological Society | . | . |
| Orion | 1985- | Operations Research Society of South Africa (ORSSA) | . | . |
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| Orissa Journal of Otolaryngology and Head & Neck Surgery | 2023- | MedKnow | . | . |
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| Ornithological Science | 2002- | J-STAGE, Japan Science and Technology Information Aggregator, Electronic | selecciones disponibles | . |
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| Orsis Organismes i Sistemes | 1985-2017 | Universidad Autónoma de Barcelona | . | . |
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| Orthopedics | 2009- | Slack Incorporated | . | . |
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