Valle, Luis A. del <br/><br/>
Determination of the rate of biodegradation in some polluted tropical waters and in some types of liquid wastes common in Puerto Rico 
by Luis A. del Valle. 
 - Mayaguez, P.R.  Water Resources Research Institute, School of Engineering  [1972] 
 - 80 leaves  ill.  28 cm. 
<br/><br/> "Completion report, A-023-PR"--Cover.  Partially funded by the Office of Water Resources Research.  "September, 1972." 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water supply--Puerto Rico.<br/>Biodegradation.<br/>Water--Pollution--Puerto Rico.<br/>Water--Purification--Biological treatment.