http://californiasurveyors.org/

http://www.acsm.net/

http://www.acsm.net/alta.html

http://csrc.ucsd.edu/

http://www.navcen.uscg.gov/gps/

http://www.ngs.noaa.gov/

http://www.ngs.noaa.gov/TOOLS/

http://www.extension.ucr.edu/certificates/gps.html

http://n1.cs.fiu.edu/cgi-bin/tfadv.cgi?p=ha#Address

http://www.leginfo.ca.gov/