Sources:

• The Tijuana River Valley notes and chronology
• Tijuana River Valley Mining
• Tijuana River Valley Sewage Treatment
• Bulletin No. 9 July 2015 The Tijuana River Valley Historic Sites (map).
• Bulletin No. 8 April 2015 The Historical Border (map) and The San Diego-Tijuana Boundary Monuments by Barbara Zaragoza.
• Bulletin No. 12 April 2016 Historic Sites of Imperial Beach.
• Bulletin No. 14 November 2016 Saving the Estuary By Barbara Zaragoza and Mike McCoy.
• Bulletin No. 11 February 2016 Bruhlmeier's Good Drinking Water
• The Tijuana River Valley: An Ecological Look into the Past, by Sam Safran at the TRNERR, 2015.
• Tijuana River Valley Historical Ecology Investigation, San Francisco Estuary Institute, 2017.
• Border Field State Park and Its Monument, by Nancy Carol Carter, Eden: Journal of the California Garden & Landscape History Society, Fall 2011.