Colorado. Division of Highways, United States. Forest Service, & United States. Federal Highway Administration. Implementation Division. (1978). I-70 in a mountain environment: Vail Pass, Colorado. Dept. of Transportation, Federal Highway Administration, Offices of Research and Development, Implementation Division.

Colorado. Division of Highways, United States. Forest Service, and United States. Federal Highway Administration. Implementation Division. I-70 in a Mountain Environment: Vail Pass, Colorado. [Washington: Dept. of Transportation, Federal Highway Administration, Offices of Research and Development, Implementation Division, 1978.

Colorado. Division of Highways, et al. I-70 in a Mountain Environment: Vail Pass, Colorado. Dept. of Transportation, Federal Highway Administration, Offices of Research and Development, Implementation Division, 1978.