Railroad Archives Online
- FondoD0046 - Andrew Klamka Collection
- Serie003 - Great Northern Railway Company (U.S.)
- Sottoserie004 - Library
- 002 - Periodicals
- 9 in più...
- Unità documentariaGNSemaphoreVol1No10 - Great Northern Railway Club 'THE SEMAPHORE', October 1924
- Unità documentariaGNSemaphoreVol1No11 - Great Northern Railway Club 'THE SEMAPHORE', November 1924
- Unità documentariaGNSemaphoreVol1No12 - Great Northern Railway Club 'THE SEMAPHORE', December 1924
- Unità documentariaGNSemaphoreVol2No1 - 'Great Northern Semaphore' January 1925
- Unità documentariaGNSemaphoreVol2No2 - 'Great Northern Semaphore' February 1925
- Unità documentariaGNSemaphoreVol2No3 - 'Great Northern Semaphore' March 1925
- Unità documentariaGNSemaphoreVol2No4 - 'Great Northern Semaphore' April 1925
- Unità documentariaGNSemaphoreVol2No5 - 'Great Northern Semaphore' May 1925
- Unità documentariaGNSemaphoreVol2No6 - 'Great Northern Semaphore' June 1925
- 42 in più...