Love those old turn-of-the-(last)-century USGS maps, Bruce -
The Chinook bookshop in Colo. Spgs. carried nearly all of them back in the early sixties when I was a student at Colorado College, and I bought a full set covering Durango to Ridgway - both ways (D&RG via Silverton & Red Mountain and RGS via Dolores, Rico & To-Hell-You-Ride).
The newer maps with green shading not only fail to show most of the railroads, IMHO they are just not as attractive visually as the older 'sepia-toned' versions.
- El Abuelo Histœrico, Greengo y Curmudgeoño de los Locomoturas Viejos y Verdes,
aka Der Grossväterlich DünkelOlivGrünDampfKesselMantelLiebHabender