Railroad Archives Online
- FondD0036 - George Werkema Collection
- Sorozat003 - Great Northern Railway Company (U.S.)
- Alsorozat014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 006 - Cabooses (Railroads)
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- Iratdarabimg208 - Great Northern Caboose X224 at Wenatchee, Washington, 1968
- Iratdarabimg209 - Great Northern Caboose X258 at Wenatchee, Washington, 1968
- Iratdarabimg212 - Great Northern Caboose X304 at South Bellingham, Washington, 1966
- Iratdarabimg213 - Great Northern Caboose X304 at South Bellingham, Washington, 1966
- Iratdarabimg216 - Great Northern Caboose X432, 1968
- Iratdarabimg217 - Great Northern Caboose X432 at Hillyard, Washington, 1965
- Iratdarabimg218 - Great Northern Caboose X443 at Rio Vista, California, 1991
- Iratdarabimg219 - Great Northern Caboose X461 at Havre, Montana, 1972
- Iratdarabimg220 - Great Northern Caboose X527 at Great Falls, Montana, 1974
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