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- Complementary Index15,968,162
- Springer Nature Journals7,085,887
- Academic Search Index2,780,000
- MEDLINE1,456,499
- Milne Open Textbooks1,147,435
- Oxfam Policy & Practice1,147,435
- Directory of Open Access Journals1,147,435
- Gale General OneFile691,033
- Supplemental Index432,533