TY  - BOOK
AU  - Rogin,Leo
TI  - The Introduction of Farm Machinery in its Relation to the Productivity of Labor..
PY  - 1931///
CY  - California : 
PB  - University of California Press, 
N1  - Contiene: Part.1: The plow with some consideration of other rillage machinery.    Part II: Wheat production
ER  -