TY  - GEN
AU  - Nuttonson,M.Y.
TI  - American Institute of Crop Ecology, study series: No. 31 
PY  - 1963///
CY  - Washington
KW  - Agricultural Ecology
KW  - Crop Ecology
KW  - Agroclimatology
KW  - Agro-Climatic
KW  - Analogues
ER  -