TY  - BOOK
AU  - Efferson, J. Norman 
AU  - Paul E. Johnston
TI  - Principles of farm management
U1  - 631.1 22
PY  - 1953///
CY  - New york
PB  - Mcgraw-hill book com.
KW  - agricultural engineering
KW  - farm management
N1  - include index and bibliography
ER  -