Railroad Archives Online
- CollectionD0046 - Andrew Klamka Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1004 - Library
- Subseries Level 2002 - Periodicals
- 21 more...
- ItemGNSemaphoreVol2No10 - 'Great Northern Semaphore' October 1925
- ItemGNSemaphoreVol2No11 - 'Great Northern Semaphore' November 1925
- ItemGNSemaphoreVol2No12 - 'Great Northern Semaphore' December 1925
- ItemGNSemaphoreVol3No1 - 'Great Northern Semaphore' January 1926
- ItemGNSemaphoreVol3No2 - 'Great Northern Semaphore' February 1926
- ItemGNSemaphoreVol3No3 - 'Great Northern Semaphore' March 1926
- ItemGNSemaphoreVol3No4 - 'Great Northern Semaphore' April 1926
- ItemGNSemaphoreVol3No5 - 'Great Northern Semaphore' May 1926
- ItemGNSemaphoreVol3No6 - 'Great Northern Semaphore' June 1926
- 30 more...