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