- Art Source International
- Boulder County, Historic Preservation Office
- Boulder County Land Use Office
- Boulder County Railway Historical Society
- Boulder Historical Society and Museum
- City of Boulder, Historic Preservation Office
- Colorado Historical Society
- Colorado Historic Railroad Preservation Association
- Colorado Railroad Museum
- Colorado State Archives
- Narrow Gauge Railroad Discussion Forum
- National Railway Historical Society
- Nederland Area Historical Society
- Nederland Chamber of Commerce
- Railway & Locomotive Historical Society
- Rocky Mountain Railroad Club
- rrhistorical.com
- Spike Systems
- US National Archives
December 15, 2006
Information Sources
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