National Council of Educational Research and Training <br/><br/>
Exemplar instructional material for pre-vocational course under work experience on introduction to plumbing .... 

 - New Delhi  NCERT  c1987 
 - [6], 46p.: ; ill.; 26cm. 
<br/><br/><label>Dewey Class. No.: </label>371.9044:696.1  / NAT