TY  - BOOK
AU  - Ohkawa Kazushi
TI  - International comparisons of productivity in agric
T2  - National Research Institute of Agriculture, Bulletin. I
U1  - X9(J):2.1.N5, H9 
PY  - 1949///
KW  - Agriculture Industry
N1  - Appendix : At the last page
ER  -