Railroad Archives Online
- FondoD0063 - Walter W. Ainsworth Collection
- Serie007 - Spokane, Portland, and Seattle Railway
- Sottoserie014 - Photographs
- 003 - Railroads--Buildings and Structures
- 002 - Depots and Freighthouses
- Unità documentariaWWASPSL1-010 - Spokane, Portland, and Seattle (SP&S) Freighthouse, Portland, Oregon, undated
- Unità documentariaWWASPSL1-011 - Spokane, Portland, and Seattle (SP&S) Freighthouse, Portland, Oregon, 1928
- Unità documentariaWWASPSL1-024 - Spokane, Portland, and Seattle (SP&S) Drawing of the Proposed Union Depot, Portland, Oregon, April 1882
- Unità documentariaWWASPSL1-027 - Union Station, Portland, Oregon, circa 1900
- Unità documentariaWWASPSL1-066 - Spokane, Portland, and Seattle (SP&S) North Bank Freighthouse, Portland, Oregon, 1928
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