Use of a type N miners' gas mask

Author: Katz, S. H.
Additional Authors: McCaa, George S.,
Year: 1929
Document Type: MAIN
Issuing Agency: U.S. Govt. Print. Off.,
Series: Miners' circular ;
Report Number: 32
Subject: Gas masks
Link: https://hdl.handle.net/2027/mdp.39015077562091

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