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