R.D. Thornton and Richard Lettel Digital Collections of Colorado (Colorado State University) 2026 Open access Read full text Cite Bookmark Add to export Share Authors: University of Colorado Boulder DOI: 10.60807/h78s5474r22x Cited by: 0 Publication details Journal / source Digital Collections of Colorado (Colorado State University) Publication date 23 February 2026 Language EN Reference Details Loading... Open full details