TY  - BOOK
AU  - Parsons, Merton S.
AU  - Robinson, Frank H.
AU  - Strickler, Paul E.
ED  - U. S. Department of Agriculture
TI  - Farm machinery: : use, depreciation, and replacement
U1  - 73 SD:338.14 
PY  - 1960///
CY  - Washington
PB  - U. S. Department of Agriculture
ER  -