Spellman, Frank R. <br/><br/>
Basic Mathematics for Water and Waste Water Operators 

 - New york  C R C Press  2014 
 - xv,278p. 
<br/><br/><label>ISBN: </label> RS 14687.60 (set of 3 vol.) 
<br/><br/><label>Dewey Class. No.: </label>628.101 SPE,F.R