A study of hazardous openings to abandoned underground mines in western Colorado
By: R. S. Dewey, L. a. Robbins, L. D. Oehler, T. L. Reed and P. A. Bilzi.
Contributors: Robbins, L. a; Oehler, L. D; Reed, T. L; Bilzi, P. A
Publisher: s.n
Published: 1980
Place of publication: S.l
Number of pages: 214
Notes: 13