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- Complementary Index20,568,549
- Gale General OneFile6,790,147
- Springer Nature Journals6,448,637
- Academic Search Index2,958,288
- OpenAIRE2,343,173
- eBook Index1,737,628
- MEDLINE1,372,644
- Directory of Open Access Journals1,071,560
- Supplemental Index649,985