Elrod, J. Mcree <br/><br/>
Construction and adaptation of the unit card / by J. McRee Elrod 

 - 2 
 - Metuchen, N.J. :  Scarecrow Press,  1978 
 - 72 p. 
 - 10126 ; no. 1 .
<br/><br/> Monografía 
<br/><br/><label>ISBN: </label>0810810905 
<br/><br/><label>Subjects--Index Terms: </label>Catalogación - Instrucción Programada 
<br/><br/><label>LC Class. No.: </label>Z693/E56 1978