Hem, John D.  1916- <br/><br/>
Study and interpretation of the chemical characteristics of natural water/ 
John D. Hem 
 - 2nd ed. 
 - Washington, D.C. :  U. S. Government Printing Office,  1970 
 - 363 p. :  ill., maps ;  24 cm. 
<br/><br/>Bibliography : p. 338-357 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Water--Composition