Spigai, Frances G. <br/><br/>
The invisible medium :  the state of the art of microform and a guide to the literature / 
by Frances G. Spigai. 
 - Washington :  ERIC Clearinghouse on Library and Information Sciences,  1973. 
<br/><br/>Includes bibliobgraphical references. 
<br/><br/><label>LCCN: </label>74191682 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Microforms.<br/>Microforms -- Bibliography.--Microforms -- Bibliography.
<br/><br/><label>LC Class. No.: </label>Z265  / .S73 
<br/><br/><label>Dewey Class. No.: </label>016.6864/3