Microfilms and microcards :  their use in research: a selected list of references / 
compiled by Blanche Prichard McCrum ; Library of Congress, United Nations 
 - Washington :  Library of Congress,  1950 
 - v, 81 p. ;  27 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microforms--Catalogs<br/>Microphotography--Bibliography
<br/><br/><label>Dewey Class. No.: </label>025.179