31. NIDA RESEARCH MONOGRAPH 552,444 MARIJUANA Marijuana : research findings : 1980 / ed. Robert C. Petersen. - Rockville, Maryland : Department of Health and Human Services, Public Health Service, Alcohol, Drug Abuse, and Mental Health Administration ; National Institute on Drug Abuse Division of Research, 1980. - IX, 225 s. ; 23 cm (NIDA Research Monograph ; 31)