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Total Categories

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Ranked By
Rank Category Total Articles Total Journals
1 Oncology 1952940 280
2 Obstetrics & Gynecology 769536 89
3 Optics 766418 95
4 Ophthalmology 541954 74
5 Orthopedics 437258 107
6 Otorhinolaryngology 318579 50
7 Operations Research & Management Science 291421 85
8 Oceanography 242653 74
9 Ornithology 80202 18
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