GEOGRAPHY

CIA World Factbook-http://www.odci.gov/cia/publications/factbook/index.html

Global Land Information System-http://edcwww.cr.usgs.gov/glis.html

World Population Database-http://dbdev.ciesin.org:8989/cgi-bin/wdb/wdbprb/fdf/PRBWDS/form

Zip Codes-http://www.usps.gov/ncsc/lookups/lookup-zip=4.html