Nineteen individually foldered pen and ink drawings on board of varying sizes, largely unsigned. The drawings feature sketches of everyday life and notable scenes found along the Santa Fe Trail, as well as portraits of well-known figures, including Kit Carson, General Custer, and James P. Beckwourth. When available the page numbers corresponding to specific drawings reproduced in The Old Santa Fe Trail have been noted.

Unless otherwise noted, all drawings are assumed to have been completed by Thomson Willing.