Railroad Archives Online
- CollectionD0036 - George Werkema Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1014 - Photographs
- Subseries Level 2003 - Railroads--Buildings and Structures
- Subseries Level 3009 - Railroads - Servicing facilities
- Itemimg1116 - Great Northern Icing Platform at Appleyard, Washington, 1974
- Itemimg1127 - Great Northern Water Tank at Whitefish, Montana, 1990
- Itemimg1128 - Great Northern Diesel Locomotive Service Facility at Whitefish, Montana, 1990
- Itemimg1133 - Great Northern Diesel Locomotive Service Facility at Wenatchee, Washington, 1987
- Itemimg1134 - Great Northern Water Tank at Troy, Montana, 1990
- Itemimg1135 - Great Northern Water Tank at Interbay, Washington, 1991
- Itemimg1143 - Great Northern Water Tank at Essex, Montana, 1990