Railroad Archives Online
- FondoD0046 - Andrew Klamka Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Subserie004 - Library
- 002 - Periodicals
- 21 más...
- Unidad documental simpleGNSemaphoreVol2No10 - 'Great Northern Semaphore' October 1925
- Unidad documental simpleGNSemaphoreVol2No11 - 'Great Northern Semaphore' November 1925
- Unidad documental simpleGNSemaphoreVol2No12 - 'Great Northern Semaphore' December 1925
- Unidad documental simpleGNSemaphoreVol3No1 - 'Great Northern Semaphore' January 1926
- Unidad documental simpleGNSemaphoreVol3No2 - 'Great Northern Semaphore' February 1926
- Unidad documental simpleGNSemaphoreVol3No3 - 'Great Northern Semaphore' March 1926
- Unidad documental simpleGNSemaphoreVol3No4 - 'Great Northern Semaphore' April 1926
- Unidad documental simpleGNSemaphoreVol3No5 - 'Great Northern Semaphore' May 1926
- Unidad documental simpleGNSemaphoreVol3No6 - 'Great Northern Semaphore' June 1926
- 30 más...