TY  - BOOK
ED  -  United Nations. Economic Commission for Europe. 
TI  - Comparative GDP levels: physical indicators, phase III 
T2  - Series:	Economic studies (United Nations. Economic Commission for Europe), 
U1  - 339.3 
PY  - 1993///.
CY  - New York : 
PB  - United Nations, 
KW  - 	 Gross domestic product -- Comparative studies.
KW  - National income -- Accounting -- Comparative studies
ER  -