Measurement of total radium and radidum-226 in environmental waters : a tentative reference method / 
Quality assurance branch 
 - Washington, D.C. :  United states government pinting office,  1976 
 - iii, 31 p. :  ill. ;  28 cm. 
 - Environmental monitoring series .
<br/><br/> EPA-600/4-76-012 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water quality<br/>Water--Pollution
<br/><br/><label>Dewey Class. No.: </label>363.7394