TY  - GEN
AU  - Johnston, Lloyd D.
ED  - World Health Organization.
TI  - Review of general  population surveys of drug abuse
T2  - WHO offset publications, no.52
SN  - 9241700521
PY  - 1980///
CY  - Geneva : 
PB  - World Health Organization
KW  - Substance abuse
KW  - Epidemiologic methods
KW  - Healthsurveys
ER  -