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Database
- Complementary Index19,597,340
- Gale General OneFile6,787,384
- Springer Nature Journals6,234,183
- Academic Search Index2,990,632
- OpenAIRE2,244,556
- eBook Index1,756,199
- MEDLINE1,406,834
- Directory of Open Access Journals1,048,031
- Supplemental Index618,945