TY  - BOOK
AU  - Chaloupka, Frank J
AU  - Laixuthai A
AU  - National Bureau Of Economic Research
TI  - Do Youths Substitute Alcohol And Marijuana? Some Econometric Evidence
T2  - Technical Working Papers
U1  - NBER TWP4662 
PY  - 1994///
CY  - Cambridge, MA
PB  - NBER
ER  -