TY  - GEN
AU  - 
TI  - American Institute of Crop Ecology series, study: No. 20 
PY  - 1958///
CY  - Washington
KW  - Agricultural Ecology
KW  - Crop Ecology
KW  - Rye-Climate
KW  - Phenology
KW  - Photo-Thermal Requirements
KW  - Rye
ER  -