TY  - BOOK
AU  - Thornthwaite C W
TI  - Cropmeter, the modern means of calculating plant maturity: instruction manual
U1  - 631.55 
PY  - 1954///
CY  - New Jersey
PB  - Johns Hopkins University
KW  - Cropmeter
KW  - Harvesting
N1  - The manual accompanies the Cropmeter
ER  -