552,451 PROBLEMS Problems of drug dependence, 1981 : proceedings of the 43rd Annual Scientific Meeting, The Committee on Problems of Drug Dependence, Inc. / ed. Louis S. Harris. - 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, 1982. - XVIII, 561 s. ; wykr. ; 23 cm (NIDA Research Monograph ; 41)