Duggal K.N. <br/><br/>
Elements of public health engineering 

 - 3rd ed rev. 
 - Delhi  S.Chand  1985 
 - xiv,412p, 22cm 
<br/><br/><label>ISBN: </label>8121900123 
<br/><br/><label>Dewey Class. No.: </label>620.85,  / D, dug