Code for identification of gas-mask canisters. 

 - Washington,  U.S. Govt. print. off.,  1930. 
 - v, 3 p.  23 cm. 
<br/><br/><label>LCCN: </label>l  30000104  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Gas masks.
<br/><br/><label>LC Class. No.: </label>HD8051  / .A62 no. 512