TY  - GEN
AU  - Gust, Steven W.
AU  - Walsh, J.Michael 
TI  - Drugs in the workplace : research and evaluation data : volume I [PDF]
T2  - NIDA research monograph series
PY  - 1989///
CY  - Fishers Lane
PB  - NIDA
KW  - arbeid
KW  - cannabis
KW  - drugs
KW  - epidemiologie
KW  - statistische data
UR  - http://www.google.com/search?q=drugs-in-the-workplace research-and-evaluation-data 91
ER  -