Ohio Vocational Education State Deptt. of Education, Columbu <br/><br/>
Trade & industrial education service teacher improvement, state of Ohio : Study guide, use of laboratory procedures in teaching trade technology unit-14 

 - Columbus  State Deptt. of Education Ohio  1948 
 - Various Page 
<br/><br/><label>Subjects--Topical Terms: </label><br/>COMMERCE AND TRADE
<br/><br/><label>Dewey Class. No.: </label>380.107 OHI