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Crack, powder cocaine, and heroin : drug purchase and use patterns in six U.S. cities

Riley, Kevin Jack, 1964-
Washington, DC : U.S. Dept. of Justice, Office of Justice Programs, National Institute of Justice : Executive Office of the President, Office of National Drug Control Policy, [1998] 1998

Crack, powder cocaine, and heroin : drug purchase and use patterns in six U.S. cities

Riley, Kevin Jack, 1964-
Washington, DC : U.S. Dept. of Justice, Office of Justice Programs, National Institute of Justice : Executive Office of the President, Office of National Drug Control Policy, [1998] 1998