Browse Items (6 total)

Dr. Clarence Bockhop experiments with grading sand in the soil bin using scale model implements and similitude principles to study soil-tool interaction.

Four men observe a tractor with extra equipment performing work on the soil in a field, for a Rural Minister Short Course, 1961.

Five pieces of equipment, including a wooden box, are identified with numbers in preparation for soil testing, May 20, 1940.

Dr. Clarence Bockhop experiments with grading sand in the soil bin using scale model implements and similitude principles to study soil-tool interaction.

Four men observe a tractor with extra equipment performing work on the soil in a field, for a Rural Minister Short Course, 1961.

Five pieces of equipment, including a wooden box, are identified with numbers in preparation for soil testing, May 20, 1940.