Useful Links:

Advisory Council on Historic Preservation:Opens in new window
http://www.achp.gov

Caltrans Historic Bridge Inventory:Opens in new window
http://www.dot.ca.gov/hq/structur/strmaint/historic.htm

California Historical Landmarks:Opens in new window
http://www.ohp.parks.ca.gov/default.asp?page_id=21387

Historical Society of Southern California:Opens in new window
http://www.socalhistory.org

Los Angeles City Historical Society:Opens in new window
http://www.lacityhistory.org

Los Angeles Conservancy:Opens in new window
http://www.laconservancy.org

National Register of Historic Places:
http://www.cr.nps.gov/places.htm

Office of Historical Preservation
https://ohp.parks.ca.gov/

Office of Historic Preservation Publications and DPR 523 Forms:Opens in new window
http://www.ohp.parks.ca.gov/default.asp?page_id=1069

Society for American Archaeology:Opens in new window
http://www.saa.org

Society for California Archaeology:Opens in new window
http://www.scahome.org

Society of Architectural Historians, Southern California:Opens in new window
http://www.sahscc.org