Railroad Archives Online
- CollectionD0011 - James M. Fredrickson Collection
- Series010 - Other Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3003 - Maintenance Facilities
- ItemJMF11-10405.0 - Sierra Railway Roundhouse at Jamestown, California in June, 1974.
- ItemJMF19-13997.0 - Missouri Pacific Railroad roundhouse at Little Rock, Arkansas on July 7, 1982.