Railroad Archives Online
- CollectionD0059 - David Emerson Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3003 - Maintenance Facilities
- ItemDEGN201314062 - Great Northern Roundhouse and Shops at Hillyard, Washington, Aerial View, undated
- ItemDEGN201314070 - Great Northern Electric Shop at Wenatchee, Washington, Before 1957