Railroad Archives Online
- CollectionD0153 - Doug Wingfield Collection
- Series007 - Spokane, Portland, and Seattle Railway
- Subseries Level 1014 - Photographs
- Subseries Level 2001 - Railroads--Equipment and Supplies
- Subseries Level 3002 - Diesel Locomotives
- ItemWingfield.230 - Spokane, Portland & Seattle Diesel Locomotive 303, 306 at Spokane, Washington, 1968
- ItemWingfield.232 - Spokane, Portland & Seattle Diesel Locomotive 313 at Spokane, Washington, 1968
- ItemWingfield.233 - Spokane, Portland & Seattle Diesel Locomotive 313, 303 at Scribner, Washington, 1968
- ItemWingfield.234 - Spokane, Portland & Seattle Diesel Locomotive 313, 303 at Scribner, Washington, 1968
- ItemWingfield.235 - Spokane, Portland & Seattle Diesel Locomotive 313, 303 at Scribner, Washington, 1968
- ItemWingfield.236 - Spokane, Portland & Seattle Diesel Locomotive 862 at Spokane, Washington, 1968
- ItemWingfield.237 - Spokane, Portland & Seattle Diesel Locomotive 862, 864 at Marshall, Washington, 1968
- 8 more...