TY  - BOOK
AU  - NATIONAL BUREAU OF ECONOMIC RESEARCH INC
ED  - NATIONAL BUREAU OF ECONOMIC RESEARCH INC
TI  - Interaction in economic research : 57th annual report   
U1  - xb4.73.N77t, L7 
PY  - 1977///
CY  - New York
PB  - Nber         
ER  -