Hoffman, Frederick L.  1865-1946. <br/><br/>
The problem of dust phthisis in the granite-stone industry, 
by Frederick L. Hoffman ... May, 1922. 
 - Washington,  Govt. print. off.,  1922. 
 - vi, 178 p.  incl. tables, diagrs.  23 cm. 
 - Bulletin of the United States Bureau of labor statistics ;  Industrial accidents and hygiene series.  no.  293. .
<br/><br/> At head of title:  U.S. Department of labor, James J. Davis, secretary. Bureau of labor statistics, Ethelbert Stewart, commissioner.  Issued also as House doc. 275, 67th Cong., 2d sess.  Previous investigations into the dust hazard of certain trades issued as Bulletins nos. 79, 82, and 231 of the U.S. Bureau of labor  statistics. 
<br/><br/>"List of references": p. 163-167. 
<br/><br/><label>LCCN: </label>l  22000227  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Dust.<br/>Granite industry and trade--Health aspects.<br/>Tuberculosis.
<br/><br/><label>LC Class. No.: </label>HD8051  / .A62 no. 293