Selection and training of part-time instructors 
U S Department of Health and Welfare 
 - Washington, USA  U.S. Government Printing Office   1955 
 - iv,28p 
 - Distributive education series; 20 .
<br/><br/><br/>Vocational division Bulletin No. 258 
<br/><br/><label>Source: </label>Books to be hide in OPAC