• http://academic.brooklyn.cuny.edu/geology/leveson/core/li...
• http://www.census.gov/cgi-bin/gazetteer
• http://www.fcc.gov/mb/audio/bickel/DDDMMSS-decimal.html
• http://www.nhc.noaa.gov/gccalc.shtml
• http://www.phy6.org/stargaze/Slatlong.htm