TY - BOOK TI - Crack, powder cocaine, and heroin: drug purchase and use patterns in six US cities T2 - Research report / National Institute of Justice AU - Riley, K. Jack CY - Washington, DC PB - National Institute of Justice [u.a.] PY - 1997 LA - English M3 - Forschungsbericht (DE-588)4155043-2 (DE-627)10467444X (DE-576)209815833 gnd-content ER -