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Database
- Complementary Index20,354,306
- OpenAIRE12,803,409
- Gale General OneFile7,524,471
- Springer Nature Journals6,628,554
- OAIster[remove]3,359,172
- Academic Search Index3,142,893
- arXiv2,602,372
- Supplemental Index1,981,493
- eBook Index1,980,463