Railroad Archives Online
- CollectionD0046 - Andrew Klamka Collection
- Series003 - Great Northern Railway Company (U.S.)
- Subseries Level 1004 - Library
- Subseries Level 2002 - Periodicals
- ItemGNSemaphoreVol1No1 - Great Northern Railway Club 'THE SEMAPHORE', January 1924
- ItemGNSemaphoreVol1No2 - Great Northern Railway Club 'THE SEMAPHORE', February 1924
- ItemGNSemaphoreVol1No3 - Great Northern Railway Club 'THE SEMAPHORE', March 1924
- ItemGNSemaphoreVol1No4 - Great Northern Railway Club 'THE SEMAPHORE', April 1924
- ItemGNSemaphoreVol1No5 - Great Northern Railway Club 'THE SEMAPHORE', May 1924
- 55 more...