Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series009 - Logging Railroads
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3003 - Freight Cars
- ItemWWASPSL8-069 - Brix Brothers Logging Company Log Cars Carrying Giant Logs at Knappton, Washington, undated