RT Book T1 The collection and interpretation of data from hidden populations T2 DHHS publication ADM T2 NIDA research monograph series JF DHHS publication A2 Lambert, Elizabeth Y. LA English PP Rockville, Md. PB U.S. Dep. of Health and Human Services, Public Health Service, Alcohol, Drug Abuse, and Mental Health Administration, National Inst. on Drug Abuse YR 1990 UL https://krimdok.uni-tuebingen.de/Record/1096512890