Workers stand beside railroad tracks, tools and ladders inside the the west portal of the Alva B. Adams Tunnel of the United States Reclamation Bureau Colorado Big Thompson Project water diversion tunnel (west portal of the Continental Divide...
Colorado-Big Thompson Project (U.S.)--People--1940-1950.; Alva B. Adams Tunnel (Colo.)--1940-1950.; Grand County (Colo.)--1940-1950.; Employees--Colorado--Grand County--1940-1950.; Hydraulic facilities--Colorado--Grand County--1940-1950.;...
[between 194 and 1947]
Display a larger image and more item information when the pointer pauses over a thumbnail
Thumbnail with title
Grid with smaller thumbnails and more detail
Select the collections to add or remove from your search