Astrophysics Data System (ADS)
a digital library portal for researchers in astronomy and physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant.
a database containg articles waiting to be published.
ISI Web of knowledge - Web of science
an academic citation indexing and search service. Its coverage encompasses the sciences, social sciences, arts and humanities.
Walker, Christopher K.. (Christopher Kidd) (CRC Press, 2016)E-book activated 12 May.
Mapping hacks : tips & tools for electronic cartography
Erle, Schuyler (First edition, O'Reilly, 2005)E-book activated 12 May.
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