Railroad Archives Online
- CollectionD0063 - Walter W. Ainsworth Collection
- Series004 - Northern Pacific Railroad Company
- Subseries Level 1014 - Photographs
- Subseries Level 2005 - Landscape photography
- ItemWWANT102 - City of Seattle bascule bridge at Fremont in Seattle, Washington, circa 1928.
- ItemWWANT104 - City of Seattle bascule bridge at Fremont in Seattle, Washington, circa 1928.
- ItemWWANT111 - Northern Pacific mountain right-of-way at Stampede, Washington, circa 1925.
- ItemWWANT113 - Northern Pacific mountain right-of-way from Stampede, Washington, circa 1925.
- ItemWWANT114 - Northern Pacific mountain right-of-way from Stampede, Washington, circa 1925.