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- Complementary Index20,536,545
- Springer Nature Journals6,433,089
- Gale General OneFile6,350,543
- Academic Search Index2,954,073
- OpenAIRE2,343,173
- eBook Index1,738,960
- MEDLINE1,369,043
- Directory of Open Access Journals1,067,208
- Supplemental Index649,544