International rules for the cataloguing of educational, scientific and cultural films and film-strips on 3" x 5" (7.5 cm x 12.5 cm) cards 

 - Paris :  UNESCO,  1956 
 - 53 
<br/><br/> Monografía 
<br/><br/><label>LC Class. No.: </label>C/Z695.64/I56