Open Access Databases

http://www.infotrieve.com/document-delivery-service

http://digital.library.upenn.edu/books/serials.html

http://www.who.int/hinari/en/

http://www.ajol.info/

http://www.bepress.com/

http://www.bioline.org.br/

https://doaj.org/

http://sparcopen.org/

http://fiuc.org/

http://onlinebooks.library.upenn.edu/

http://archive.ifla.org/VII/s7/projects/litmain.htm

http://www.unesco.org/new/en/unesco/resources/online-materials/publications/unesdoc-database/

http://www.fftc.agnet.org/

http://www.ncbi.nlm.nih.gov/pmc/

http://www.bioone.org/

http://ejb.ucv.cl/index.php/ejbiotechnology

http://www.ncbi.nlm.nih.gov/

http://jbiol.biomedcentral.com/

http://www.insectscience.org/

http://www.ncbi.nlm.nih.gov/pmc/

http://www.webanalytes.com/

http://www.mdpi.com/journal/molecules

http://toxnet.nlm.nih.gov/

http://ww1.iucr.org/cww-top/data.index.html

http://www.sciencedirect.com/preprintarchive

https://www.epa.gov/science-and-technology

https://pubs.er.usgs.gov/

http://aisel.aisnet.org/jais/

http://msp.org/agt/2016/16-1/

https://www.math.uni-bielefeld.de/documenta/Welcome-eng.html

https://www.math.uni-bielefeld.de/~rehmann/DML/dml_links.html

http://msp.org/gt/2016/20-1/

http://projecteuclid.org/DPubS?Service=UI&version=1.0&verb=Display&handle=euclid&page=about&aboutPage=about_error

http://arxiv.org/

http://cds.cern.ch/

http://www.livingreviews.org/

http://adswww.harvard.edu/

http://iopscience.iop.org/journal/1367-2630;jsessionid=24E61D81A228D304B093ED11AC781878.c3

http://www.nationalacademies.org/publications/

http://documents.worldbank.org/curated/en/home

http://www.infotrieve.com/document-delivery-service

E-Newspapers

http://newspaperarchive.com/

http://www.onlinenewspapers.com/

E-Libraries

http://www.baen.com/catalog/category/view/s/free-library/id/2012

http://e-library.net/

http://www.thefreelibrary.com/

http://elibrary.worldbank.org/

Useful Links

http://www.knowledgeoftoday.org/2014/07/list-of-40-free-educational-websites.html?m=1

Services        

http://etheses.dur.ac.uk/cgi/search/simple

http://freecomputerbooks.com/