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Total Categories

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Ranked By
Rank Category Total Articles Total Journals
1 Oncology 1953663 280
2 Obstetrics & Gynecology 769690 89
3 Optics 766767 95
4 Ophthalmology 542121 74
5 Orthopedics 437511 107
6 Otorhinolaryngology 318683 50
7 Operations Research & Management Science 291597 85
8 Oceanography 242850 74
9 Ornithology 80209 18
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