Platt J I <br/><br/>
Series of elementary exercises upon logical maps 

 -  1945 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>46779 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology
<br/><br/><label>Dewey Class. No.: </label>H:U11f, H5;K8