TY  - JA
AU  - Wittwer,S.H.
TI  - Carbon dioxide and climatic change:  an agricultural perspective [on crop productivity]
SN  - 0022-4561
U1  - 81-671844 
PY  - 1980///
KW  - Meteorology and climatology
KW  - Plant production
N1  - ill
T2  - Journal of Soil and Water Conservation
ER  -