There are 1,898 titles that begin with the letter O
- Operations management. (ISSN: 1529-5648)
- Operations report / Franchise Tax Board
- Operations research and decisions. (ISSN: 2081-8858)
- Operations research for health care. (ISSN: 2211-6923, 2211-6931)
- Operations research letters. (ISSN: 0167-6377, 1872-7468)
- Operations Research Perspectives. (ISSN: 2214-7160)
- Operations research. (ISSN: 0030-364X, 1526-5463)
- Operative dentistry. (ISSN: 0361-7734, 1559-2863)
- Operative neurosurgery. (ISSN: 2332-4252, 2332-4260)
- Operative Orthopädie und Traumatologie. (ISSN: 0934-6694, 1439-0981)
- Operative techniques in cardiac & thoracic surgery. (ISSN: 1085-5637, 1876-4770)
- Operative techniques in general surgery. (ISSN: 1524-153X, 1558-383X)
- Operative techniques in neurosurgery. (ISSN: 1092-440X, 1557-9409)
- Operative techniques in orthopaedics. (ISSN: 1048-6666, 1558-3848)
- Operative techniques in otolaryngology--head and neck surgery. (ISSN: 1043-1810, 1557-9395)
- Operative techniques in plastic and reconstructive surgery. (ISSN: 1071-0949, 1558-0741)
- Operative techniques in sports medicine (ISSN: 1060-1872, 1557-9794)
- Operative techniques in thoracic and cardiovascular surgery. (ISSN: 1522-2942, 1532-8627)
- Opérations de l'année ...
- Opérations de l'année ...
- Opérations, essais et rapport du Comité des fruits de la Sociéte d'agriculture et d'horticulture de Montréal
- Opflow (ISSN: 0149-8029, 1551-8701)
- Ophthalmic and physiological optics. (ISSN: 0275-5408, 1475-1313)
- Ophthalmic epidemiology. (ISSN: 0928-6586, 1744-5086)
- Ophthalmic genetics. (ISSN: 1381-6810, 1744-5094)
- Ophthalmic paediatrics and genetics. (ISSN: 0167-6784)
- Ophthalmic plastic and reconstructive surgery. (ISSN: 0740-9303, 1537-2677)
- Ophthalmic research. (ISSN: 0030-3747, 1423-0259)
- Der Ophthalmologe : Zeitschrift der Deutschen Ophthalmologischen Gesellschaft. (ISSN: 0941-293X, 1433-0423)
- Ophthalmologica extra. (ISSN: 2296-1445)
- Die Ophthalmologie. (ISSN: 2731-720X, 2731-7218)
- Ophthalmology and eye diseases. (ISSN: 1179-1721)
- Ophthalmology and therapy. (ISSN: 2193-8245, 2193-6528)
- Ophthalmology journal. (ISSN: 2450-7873, 2450-9930)
- Ophthalmology science. (ISSN: 2666-9145)
- Ophthalmology times. (ISSN: 0193-032X, 2150-7333)
- Ophthalmology update. (ISSN: 1993-2863)
- Ophthalmology. (ISSN: 0161-6420, 1549-4713)
- Opinio Juris in Comparatione (ISSN: 2036-4423, 2281-5147)
- Opinio juris. (ISSN: 2326-0386)
- L'opinion publique : journal illustré.
- L'opinion publique.
- Opinions of the Office of Legal Counsel of the United States Department of Justice. (ISSN: 0270-2134)
- Opinions. (ISSN: 1756-7629)
- Opinião pública. (ISSN: 0104-6276, 1807-0191)
- La Opinión de A Coruña (ISSN: 1576-8694)
- Opinión jurídica. (ISSN: 1692-2530, 2248-4078)
- Oplink Communications, Inc. MarketLine Company Profile
- Opolis : an international journal of suburban and metropolitan studies. (ISSN: 1552-2148, 1551-5869)
- Opolskie studia administracyjno-prawne. (ISSN: 1731-8297, 2658-1922)
- Oppdragsrapport. A - Norges vassdrags- og energidirektorat (ISSN: 1503-0318)
- Oppenheimer Holdings Inc. MarketLine Company Profile
- Oppervlaktetechnieken (ISSN: 1571-9995)
- Opportunistic pathogens. (ISSN: 1386-2618, 1878-3694)
- Opportunities for research in Renaissance drama (exclusive of Shakespeare). (ISSN: 2378-3990, 2380-1182)
- Opportunities for research in Renaissance drama. (ISSN: 2378-4016, 2380-1166)
- Opportuun : tijdschrift voor het Openbaar Ministerie (ISSN: 1380-3913)
- Opsearch. (ISSN: 0030-3887, 0975-0320)
- OPSI (ISSN: 1693-2102, 2686-2352)
- Optica applicata. (ISSN: 0078-5466, 1899-7015)
- Optica quantum. (ISSN: 2837-6714)
- Optica. (ISSN: 2334-2536)
- Optical and quantum electronics. (ISSN: 0306-8919, 1572-817X)
- Optical Cable Corporation MarketLine Company Profile
- Optical data processing and storage. (ISSN: 2084-8862)
- Optical engineering. (ISSN: 0091-3286, 1560-2303)
- Optical fiber technology. (ISSN: 1068-5200, 1095-9912)
- Optical materials express. (ISSN: 2159-3930)
- Optical materials. (ISSN: 0925-3467, 1873-1252)
- Optical Materials. X. (ISSN: 2590-1478)
- Optical memory & neural networks. (ISSN: 1060-992X, 1934-7898)
- Optical memory news. (ISSN: 0741-5869)
- Optical nanoscopy. (ISSN: 2192-2853)
- Optical review. (ISSN: 1340-6000, 1349-9432)
- Optical switching and networking : a computer networks journal. (ISSN: 1573-4277, 1872-9770)
- Opticon1826. (ISSN: 2049-8128)
- Optics (ISSN: 2673-3269)
- Optics & laser technology. (ISSN: 0030-3992, 1879-2545)
- Optics & photonics focus (ISSN: 2013-1445)
- Optics and lasers in engineering. (ISSN: 0143-8166, 1873-0302)
- Optics and photonics letters. (ISSN: 1793-5288, 1793-7140)
- Optics and spectroscopy. (ISSN: 0030-400X, 1562-6911)
- Optics communications. (ISSN: 0030-4018, 1873-0310)
- Optics continuum. (ISSN: 2770-0208)
- Optics express. (ISSN: 1094-4087)
- Optics letters. (ISSN: 0146-9592, 1539-4794)
- Optics technology. (ISSN: 0374-3926, 1878-7371)
- Optik (ISSN: 1653-3666)
- Optik. (ISSN: 0030-4026, 1618-1336)
- OPTIMA newsletter (ISSN: 0376-5016)
- Optima. (ISSN: 0030-4050)
- Optimal control applications and methods. (ISSN: 0143-2087, 1099-1514)
- Optimal Payments Plc MarketLine Company Profile
- Optimawork Blog
- Optimization : journal of research in management. (ISSN: 0974-0988)
- Optimization and engineering. (ISSN: 1389-4420, 1573-2924)
- Optimization letters. (ISSN: 1862-4472, 1862-4480)
- Optimization methods & software. (ISSN: 1055-6788, 1029-4937)
- Optimize. (ISSN: 1537-2308)
- Optimum online : the journal of public sector management. (ISSN: 1910-7706)