TY - JOUR TI - Weekly marijuana use as a risk factor for initial cocaine use: Results from a six-wave national survey T2 - Journal of child & adolescent substance abuse VL - 5 IS - 4 EP - 78 AU - Miller, T. Q. A2 - Volk, R. J. PY - 1996 LA - English SP - 55 SN - 1067-828X ER -