List of free databases and search engines (most listed in ):

AGRIS: Agriculture Agriculture Food and Agricultural Organization http://agris.fao.org/ of the United Nations

Analytical Sciences Analytical National Science and Digital Library Chemistry the Analytical Chemistry Division of http://home.asdlib.org/ the American Chemical Society

Anthropological Index Online Anthropology Royal Anthropological Institute https://aio.therai.org.uk/

arXiv Physics, Cornell University https://arxiv.org/ Mathematics, , Nonlinear science, Quantitative

Astrophysics Data Astrophysics, Harvard University System Geophysics, http://adswww.harvard.edu/ Physics

BASE: Bielefeld Multidisciplinary Bielfed University https://www.base-search.net/about/en/

Citebase Search Mathematics, University of Southampton http://eprints.soton.ac.uk/cgi/search/advanced Computer science, Physics

CiteSeerX Computer science, Pennsylvania State http://citeseerx.ist.psu.edu/index Statistics, University Mathematics

Collection of Computer science Alf-Christian Achilles Computer Science Bibliographies http://liinwww.ira.uka.de/bibliography/ Directory of Open Journals Lund University Access Journals https://doaj.org/

EconBiz Economics ZBW – German National Library http://www.zbw.eu/en/ of Economics – Leibniz Information Centre for Economics

ERIC: Educational U.S. Department of Resource Information Education Center https://eric.ed.gov/

GENESIS Women’s history London Metropolitan University http://www.lse.ac.uk/library/collections/featuredCollections/womensLibraryLSE.aspx

Google Scholar Multidisciplinary Google https://scholar.google.com/

PubMed Medicine U.S. National Institutes of http://www.ncbi.nlm.nih.gov/pmc/ Health’s National Library of Medicine

Jurn Multidisciplinary Jurn http://www.jurn.org/

Lingbuzz Linguistics Center for Advanced Study http://ling.auf.net/lingbuzz in Theoretical Linguistics, University of Tromso

Medline Plus Medicine U.S. National Library of https://medlineplus.gov/healthtopics.html Medicine, U.S. National Institutes of Health, and the U.S. Department of Health and Human Services

Microsoft Academic Search Multidisciplinary Microsoft https://academic.microsoft.com/

NBER: National Bureau Economics National Bureau of Economic of Economic Research Research http://www.nber.org/

PhilPapers Philosophy PhilPapers http://philpapers.org/

POPLINE Population, Knowledge for Health, Center http://www.popline.org/ Family Planning, for Communication Programs, Reproductive Health Johns Hopkins Bloomberg School of Public Health

Psychology’s Psychology York University Feminist Voices http://www.feministvoices.com/

PubChem Chemistry National Center for Biotechnology https://pubchem.ncbi.nlm.nih.gov/ Information and the U.S. National Library of Medicine

Science.gov Multidisciplinary Science.gov, U.S. Department of http://www.science.gov/index.html Energy, Office of Scientific and Technical Information

ScienceOpen Multidisciplinary ScienceOpen https://www.scienceopen.com/

SSRN: Social Science Social science Social Science Electronic Research Network Publishing http://www.ssrn.com/en/

WorldWide Science Multidisciplinary WorldWideScience Alliance, http://worldwidescience.org/ Incl. U.S. Department of Energy