Drainage manual 

 - First 
 - U.S. Department of the Interior  1978 
 - 286p.  fig., table 
<br/><br/><label>Nat. Bib. No.: </label>4788 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Engineering 
<br/><br/><label>Universal Decimal Class. No.: </label>626.86  / DRA