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 3004 - Maintenance of Way support
- Itemimg1153 - Great Northern Section Maintenance Building at Cut Bank, Montana, 1990
- Itemimg1154 - Great Northern Section Maintenance Building at Cut Bank, Montana, 1990
- Itemimg1155 - Great Northern Section House at Cashmere, Washington, 1987
- Itemimg1156 - Great Northern Section House at Cashmere, Washington, 1987
- Itemimg1157 - Great Northern Section House at Cashmere, Washington, 1987
- Itemimg1158 - Great Northern Section House at Cashmere, Washington, 1987
- Itemimg1159 - Great Northern Handcar House Foundation at Leavenworth, Washington, 1987
- Itemimg1160 - Great Northern Section Foreman House at Merritt, Washington, 1987
- Itemimg1161 - Great Northern Section Foreman House at Merritt, Washington, 1987