Open access e-book
- Digital Book Index (http://www.digitalbookindex.org/about.html#_blank )
- DOAB (Directory of open access books) (https://www.doabooks.org/#_blank)
- World Digital Library (https://www.wdl.org/en/#_blank )
- Open Text book (Gateway to access text books of several prestigious university of USA) ( https://open.umn.edu/opentextbooks/#_blank )
- Open Stax College (Text books for undergraduates from Rice University,USA) ( https://openstax.org/ )
- OAPEN (Freely accessible academic books) ( https://www.oapen.org/ )
- Hathi Trust (Collection of millions of titles digitized from libraries of academic & research institutions around the world) ( https://www.hathitrust.org/ )
- National Digital Library of India (https://ndl.iitkgp.ac.in/)
- Bengali Books (Rare Bengali Books from University of Heidelberg)( https://www.ub.uni-heidelberg.de/Englisch/fachinfo/suedasien/buecher/bengali.html )
- Bengali Books (Books from West Bengal State Central Library) ( http://dspace.wbpublibnet.gov.in:8080/jspui/ )
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