TY  - BOOK
AU  - Heady, E.O. and Olson (R.O)
ED  - Heady, E.O. and Olson (R.O)
TI  - Substitution Relationships, Resource Requirements and Income Variability in the utilization of for rage crops
T2  - Research Bulletin 390
U1  - X9(J):9.73.N52, J2 
PY  - 1952///
CY  - U.S.
PB  - Bureau of Agriculture Economics       
ER  -