TY  - BOOK
AU  - Loomis Ralth A.
AU  - Barton Glen T.
TI  - Productivity of agriculture: United States, 1870-1958 
PY  - 1961///
CY  - Washington, DC
PB  - U.S. Dept. of Agriculture
KW  - Agriculture
KW  - productivity
KW  - USA
N1  - Footnotes
ER  -