34. NIDA RESEARCH MONOGRAPH 552,446 PROBLEMS Problems of drug dependence, 1980 : proceedings of the 42nd Annual Scientific Meeting, The Committee on Problems of Drug Dependence, Inc. / ed. Louis S. Harris. - Rockville, Maryland s Department of Health and Human Services, Public Health Service, Alcohol, Drug Abuse, and Mental Health Administration ; National Institute on Drug Abuse Division of Research, 1981. - XIII, 441 s. : il. , wykr. ; 23 cm (NIDA Research Monograph ; 34)