Railroad Archives Online
- CollectionD0046 - Andrew Klamka Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1004 - Library
- Subseries Level 2002 - Periodicals
- 13 more...
- ItemGNSemaphoreVol2No2 - 'Great Northern Semaphore' February 1925
- ItemGNSemaphoreVol2No3 - 'Great Northern Semaphore' March 1925
- ItemGNSemaphoreVol2No4 - 'Great Northern Semaphore' April 1925
- ItemGNSemaphoreVol2No5 - 'Great Northern Semaphore' May 1925
- ItemGNSemaphoreVol2No6 - 'Great Northern Semaphore' June 1925
- ItemGNSemaphoreVol2No7 - 'Great Northern Semaphore' July 1925
- ItemGNSemaphoreVol2No8 - 'Great Northern Semaphore' August 1925
- ItemGNSemaphoreVol2No9 - 'Great Northern Semaphore' September 1925
- ItemGNSemaphoreVol2No10 - 'Great Northern Semaphore' October 1925
- 38 more...