TY  - GEN
AU  - Nuttonson,M.Y.
TI  - American Institute of Crop Ecology series, study: No. 19 
PY  - 1957///
CY  - Washington
KW  - Agricultural Ecology
KW  - Crop Ecology
KW  - Barley-Climate
KW  - Phenology
KW  - Photo-Thermal Requirments
ER  -