Railroad Archives Online
- FondD0288 - Terence Wahl Collection
- Sorozat004 - Northern Pacific Railroad Company
- Alsorozat014 - Photographs
- 001 - Railroads--Equipment and Supplies
- 003 - Freight Cars
- IratdarabTRWahl0010 - Northern Pacific Boxcar 39885, Bellingham, Washington, August 1951
- IratdarabTRWahl0115 - Northern Pacific Log Car 124352, Bellingham, Washington, undated
- IratdarabTRWahl0116 - Northern Pacific Log Car 124562, Bellingham, Washington, undated
- IratdarabTRWahl0117 - Northern Pacific Log Car 121520, Bellingham, Washington, undated
- IratdarabTRWahl0125 - Northern Pacific Boxcar 6033, Bellingham, Washington, undated
- IratdarabTRWahl0139 - Northern Pacific Boxcar 5017, Bellingham, Washington, undated
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