TY  - BOOK
AU  - Loomis, Ralph A.,
AU  - Barton, Glen Thomas,
TI  - Productivity of agriculture, United States, 1870-1958
U1  - 338.10973 
PY  - 1961///
CY  - Washington,
PB  - U. S. Dept. of Agriculture
KW  - Agriculture
KW  - Economic aspects
KW  - United States
KW  - Farm income
N1  - Literature cited p. 38-39
ER  -