H,R. Langman <br/><br/>
How to make working diagram models 
Langman, H.R 
 - London  The technical press ltd.  1939 
 - viii, 73 p.  ill. 
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<br/><br/><label>Subjects--Topical Terms: </label><br/>MCE
<br/><br/><label>Dewey Class. No.: </label>621.3  / LAN