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Database
- Complementary Index20,582,115
- Gale General OneFile6,797,351
- Springer Nature Journals6,456,976
- Academic Search Index2,961,769
- OpenAIRE2,343,173
- eBook Index1,743,742
- MEDLINE1,380,818
- Directory of Open Access Journals1,073,210
- Supplemental Index650,408