In my research, I’ve come across many documents that I would like to share, when possible. Some of these are public domain and are in PDF format.  Documents created by Michael F Ballard are copyrighted and are not public domain. Many are highway and geology related but don’t necessarily relate to the topics on this website.

Highways

• California Road Sign Date Code Guide – Michael F Ballard
• Ridge Route – National Register Of Historic Places Listing
• Caltrans D7 Control Cities Map – 1964 – Caltrans
• California Highways and Public Works Index – Caltrans
• LA-02-Sept-1976 – Glendale Blvd to US 101 – Caltrans
• LA-02-April-1976 – US 101 to I-405 – Caltrans
• Caltrans D7 Postmile Index – 1997 – Caltrans
• Traffic Bulletin No 6 – Auto-Oriented Cities – April 1963 – Caltrans
• Guide to Ramp Intersection Analysis – 1975 – Caltrans

Geology

• June 2019 Preliminary Geologic Study of the southern Forest Service gate on the Ridge Route, Los Angeles County, CA – Michael F Ballard
• Notes on the geology of the Ridge Basin and San Gabriel Fault – John Crowell, 1952
• Ridgecrest Earthquake Field Trip – August 2019 – Michael F Ballard

Railroads

• 1981 Caltrans Survey of the Pacific Electric Railway – Caltrans
• 1933 map of the Pacific Electric Railway

Engineering

• Truss Bridge Study Poster – NPS / Historic American Engineering Record