TY  - BOOK
AU  - NATIONAL BUREAU ECONOMIC RESEARCH INC.
TI  - NEW DIRECTIONS IN ECONOMIC RESEARCH
T2  - 0
U1  - 428 
PY  - 1971///
CY  - U.S.A.
PB  - NATIONAL BUREAU ECONOMIC
KW  - LINGUISTICA Y FILOSOFIA
N1  - INGLES-LIBRO/INVESTIGACION-ECONOMICA
ER  -