Hassan Fathy

Here is an online link to Hassan Fathy's book 'Natural Energy and Vernacular Architecture'. It covers topics concerning architecture in hot and arid climates and has examples of how to utilize natural energy sources in vernacular architecture.
http://www.unu.edu/unupress/unupbooks/80a01e/80A01E00.htm

There is also another site with an online digital library which contains a biography, images, plans, sections, elevations and pdf reports on his works.
http://archnet.org/library/parties/one-party.tcl?party_id=1