Proctor, R.V. <br/><br/>
Rock tunneling with steel supports  with an introduction to tunnel geology 

 - Ohio  Youngstown  1946 
 - 271p.  Illustration  26cm x 18cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Tunneling<br/>Structural geology
<br/><br/><label>Dewey Class. No.: </label>625.13  / PRO