Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series007 - Spokane, Portland, and Seattle Railway
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3001 - Bridges
- 15 more...
- ItemWWASPSL3-001 - Spokane, Portland, and Seattle (SP&S) Bridge Piers at North Portland, Oregon, March 21, 1908
- ItemWWASPSL3-002 - Spokane, Portland, and Seattle (SP&S) Bridge Piers at North Portland, Oregon, November 7, 1907
- ItemWWASPSL3-003 - Spokane, Portland, and Seattle (SP&S) Bridge Piers at North Portland, Oregon, April 21, 1907
- ItemWWASPSL3-004 - Spokane, Portland, and Seattle (SP&S) Bridge Girders at North Portland, Oregon, April 1, 1908
- ItemWWASPSL3-005 - Spokane, Portland, and Seattle (SP&S) Bridge Pier at North Portland, Oregon, March 7, 1908
- ItemWWASPSL3-006 - Spokane, Portland, and Seattle (SP&S) Work Train on Bridge at North Portland, Oregon, April 16, 1908
- ItemWWASPSL3-007 - Spokane, Portland, and Seattle (SP&S) Bridge Girders at North Portland, Oregon, March 21, 1908
- ItemWWASPSL3-008 - Spokane, Portland, and Seattle (SP&S) Bridge at North Portland, Oregon, February 20, 1908
- ItemWWASPSL3-009 - Spokane, Portland, and Seattle (SP&S) Bridge at North Portland, Oregon, February 20, 1908
- 84 more...