Udall, Stewart L. <br/><br/>
Welded Steel Penstocks 
/ by Stewart L.Udall 
 - Colorado  Department of the Interior Bureau of Reclamation  1966 
 - viii, 51p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Penstocks
<br/><br/><label>Dewey Class. No.: </label>627.882  / WEL