Pynciau a Argymhellir O fewn eich chwiliad
Dangos 1 - 3 canlyniadau o 3 ar gyfer chwilio '', amser ymholiad: 0.04e Mireinio'r Canlyniadau
1
National trends in drug use and related factors among American high school students and young adults, 1975-1986 /
gan Johnston, Lloyd
Cyhoeddwyd 1987
Government Document Llyfr
2
National survey results on drug use from the Monitoring the Future study, 1975-1997 /
gan Johnston, Lloyd
Cyhoeddwyd 1998
Government Document Llyfr
3
Use of licit and illicit drugs by America's high school students, 1975-1984 /
gan Johnston, Lloyd
Cyhoeddwyd 1985
Government Document Llyfr
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