Open Access Books Available in the English Language and Their Access Links: 

1. Arxiv: database of Physics

2. AGRIS: Agricultural Database

3. Analytical Science Digital Library (ASDL)

4. Anthropological Index Online (Bibliographical database)

5. Arnetminer (Online service used to index and search academic social networks)

6. Astrophysics Data System (Astrophysics, Geophysics, Physics)

7. BASE: Bielefeld Academic Search Engine (Multidisciplinary)

8. Bioinformatic Harvester

9. ChemXSeer: database of Chemistry

10. CHBD: Circumpolar Health Bibliographic Database (Medicine)

11. CiteSeerX (Science)

12. CogPrints: Cognitive Sciences Eprint Archives

13. CERN Document Server

14. EconBiz

15. ERIC: Educational Resource Information Center

16. GENESIS (Women’s history, Feminism)

17. SciTech Connect: Department of Energy Scientific and Technical Information

18. Intute (Social sciences and Humanities)

19. Mendeley (Multidisciplinary)

20. eSocialscience (Social Sciences)

21. OAIster (Multidisciplinary)

22. OpenGray (Multidisciplinary)

23. PhilPapers

24. POPLINE (Population,Family Planning,Reproductive Health)

25. PubChem (Chemistry)

26. PubPsych (Psychology)

27. RePEc: Research Papers in Economics

28. SafetyLit (Injury prevention literature)

29. gov (Physical sciences)

30. SSRN: Social Science Research Network

31. SPIRES-HEP

32. WorldWideScience