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Number Category Total Articles Total Journals
1 Obstetrics & Gynecology 497644 99
2 Oceanography 188564 77
3 Oncology 1194658 294
4 Operations Research & Management Science 215364 91
5 Ophthalmology 379782 78
6 Optics 549139 101
7 Oral Health 1 0
8 Ornithology 45623 17
9 Orthopedics 390687 109
10 Otorhinolaryngology 220703 54
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