TY  - TH
AU  - Opal Mearns,L.
TI  - Technological change, climatic variability, and winter wheat yields in the great plains of the United States
PY  - 1988///
CY  - Los Angeles, CA (USA)
PB  - University of California, 
KW  - Cartography
KW  - Climatic change
KW  - Environmental factors
KW  - Plains
KW  - Plant production
KW  - Technology transfer
KW  - USA
KW  - Winter crops
KW  - Yields
KW  - AGROVOC
N1  - Thesis (Ph. D.) Geography
ER  -