TY  - BOOK
AU  - Ducoff L I
AU  - Hagood M I
ED  - Social Science Research Council. New York
TI  - Labour force definition and measurement: recent experience in the United States
U1  - 331.01 
PY  - 1947///
CY  - New York
KW  - Labor economics
N1  - Bulletin 56
ER  -