Drug use among U.S. workers : prevalence and trends by occupation and industry categories

by Hoffmann, John P.
Published: Substance Abuse and Mental Health Services Administration, Office of Applied Studies, U.S. Dept. of Health and Human Services, Public Health Service ; [Supt. of Docs., U.S. G.P.O., distributor], 1996

An analysis of worker drug use and workplace policies and programs

by Hoffmann, John P. 1962-
Published: SAMHSA, Office of Applied Studies, 1997