Warner, Lawrence Allen,  1914- <br/><br/>
Geology of the eastern part of the Harold D. Roberts Tunnel, Colorado (Stations 690+00 to 1238+58) / 
by Lawrence A. Warner and Charles S. Robinson 
 - Washington :  U.S. Govt. Print. Off.,  1981 
 - vi, 31 p. :  ill., (5 fold. in pocket) ;  29 cm. 
 - Geological Survey professional paper ;  831-D .
<br/><br/>Bibliography: p. 31 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering geology--Harold D. Roberts Tunnel--Colorado
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Geology--Harold D. Roberts Tunnel--Colorado
<br/><br/><label>Dewey Class. No.: </label>624.192