John Cornelius Siemens

Mechanics of Soil Under the Influence of Model Tillage Tools

John Cornelius Siemens, J. Siemens, 1963 .

Calibrating and maintaining spray equipment

B. J. Butler, John Cornelius Siemens, 1971 .

Calibrating and adjusting granular row applicators

John Cornelius Siemens, 1969 .

Calibrating and maintaining spray equipment / 1038

B. J. Butler, John Cornelius Siemens, 1971 .