Case, Richard B. <br/><br/>
Small water purification systems / 
by Richard B. Case, and Toni K. Ristau. 
 - Denver, Colo. :  United States Department of the Interior, Bureau of Land Management:  Available from Denver Service Center,  1981 
 - 29 p. :  ill. ;  28 cm. 
 - Technical note ;  351 .
<br/><br/> "Division of Scientific Systems Development and Division of Engineering, Bureau of Land Management, U.S. Department of the Interior."  "July 1981."  Periodic updating anticipated. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Purification--Equipment and supplies.<br/>Drinking water--Standards--United States.
<br/><br/><label>Dewey Class. No.: </label>639.9