Proctor, Robert V.  1890-1967. <br/><br/>
Rock tunneling with steel supports / 
by Robert V. Proctor, Thomas L. White ; with an introduction to tunnel geology / by Karl Terzaghi. 
 - Revised, 1968 
 - Youngstown, Ohio :  Commercial Shearing,  1977. 
 - 293 pages :  illustrations. 
<br/><br/>Bibliography: page 99. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tunneling.<br/>Geology, structural.
<br/><br/><label>Dewey Class. No.: </label>624.19