Principles of farm machineryが好きなら

Agricultural process engineering

S. M. Henderson

[William Wheeler Hubbell, authorized to apply for patents.]

United States. Congress. Senate. Committee on Patents

Farm power and machinery management

Donnell Hunt

Soil and Water Conservation Engineering

Glenn O. Schwab

Handy farm devices and how to make them

Rolfe Cobleigh

Permaculture

Bill Mollison