Center of Southwest Studies Fort Lewis College https://swcenter.fortlewis.edu/ResearchResources/Archives/FindingAids.aspx
U.S. Geological Survey
Searchable maps from the US Geological Survey
Resources of facts:
The Hanging Tree - Pioneers of the San Juan Country compiled by Sarah Platt Decker has several accounts of this murder and hanging most notably book 2 page 85.
Durango Smelter - Durango Diary by Duane Smith - Page 50 to 53
Recommended reading regarding Durango and surrounding areas.
Rocky Mountain Boom Town - by Duane Smith
Durango Diary II - by Duane Smith
A Colorado History - by Ubbelohde, Benson and Smith
Pioneers of the San Juan Country - compiled by Sarah Platt Decker
The Road That Silver Built by P. David Smith
Pioneers of the San Juan Country is a highly recommended book available at Maria's Bookshop in downtown Durango. It is actually a combination of four previously published books. It is a compilation of stories written by some of the earliest white pioneers to come to the San Juan mountains.