Railroad Archives Online
- CollectionD0046 - Andrew Klamka Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1004 - Library
- Subseries Level 2002 - Periodicals
- 48 more...
- ItemGNSemaphoreVol5No1 - 'Great Northern Semaphore' January 1928
- ItemGNSemaphoreVol5No2 - 'Great Northern Semaphore' February 1928
- ItemGNSemaphoreVol5No3 - 'Great Northern Semaphore' March 1928
- ItemGNSemaphoreVol5No4 - 'Great Northern Semaphore' April 1928
- ItemGNSemaphoreVol5No5 - 'Great Northern Semaphore' May 1928
- ItemGNSemaphoreVol5No6 - 'Great Northern Semaphore' June 1928
- ItemGNSemaphoreVol5No7 - 'Great Northern Semaphore' July 1928
- ItemGNSemaphoreVol5No8 - 'Great Northern Semaphore' August 1928
- ItemGNSemaphoreVol5No9 - 'Great Northern Semaphore' September 1928
- 3 more...