TY  - BOOK
AU  - "NATIONAL BUREAU OF ECONOMIC RESEARCH, INC"
ED  - "NATIONAL BUREAU OF ECONOMIC RESEARCH, INC"
TI  - "50TH annual report,1970"
U1  - "X.73.N70<-n20r, L" 
PY  - 1970///
CY  - Newyork
PB  - National Bureau of Economic Research   
ER  -