Railroad Archives Online
- FondD0046 - Andrew Klamka Collection
- Sorozat003 - Great Northern Railway Company (U.S.)
- Alsorozat004 - Library
- 002 - Periodicals
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- IratdarabGNSemaphoreVol2No3 - 'Great Northern Semaphore' March 1925
- IratdarabGNSemaphoreVol2No4 - 'Great Northern Semaphore' April 1925
- IratdarabGNSemaphoreVol2No5 - 'Great Northern Semaphore' May 1925
- IratdarabGNSemaphoreVol2No6 - 'Great Northern Semaphore' June 1925
- IratdarabGNSemaphoreVol2No7 - 'Great Northern Semaphore' July 1925
- IratdarabGNSemaphoreVol2No8 - 'Great Northern Semaphore' August 1925
- IratdarabGNSemaphoreVol2No9 - 'Great Northern Semaphore' September 1925
- IratdarabGNSemaphoreVol2No10 - 'Great Northern Semaphore' October 1925
- IratdarabGNSemaphoreVol2No11 - 'Great Northern Semaphore' November 1925
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