A new book has recently been published: GUILTY--BUT NOT AS CHARGED. It has much good documented information on Bob Meldrum who was a Pinkerton agent/deputy/stock detective/mine guard in Colorado and Wyoming in the early 1900's. It contains an extensive bibliography, photographs, many old newspaper articles and chapter notes documenting the actions of Meldrum.
It also contains information on Joe Trimmer of Rifle who was related to the Hurlburt family.
You can order the book from email@example.com for $15.95, plus shipping.