Kниги автора CYRIL G. HOPKINS

Directions for the breeding of corn, including methods for the prevention of in-breeding

For Better crops

How Greece Can Produce More Food

Illinois crop yields from soil experiment fields

Laboratory manual for soil fertility

Question summary to accompany Soil fertility and permanent agriculture

Soil fertility and permanent agriculture

Soil fertility laboratory manual

Soil treatment for peaty swamp lands, including reference to sand and alkali soils

Soil treatment for wheat in rotations, with special reference to southern Illinois soils

The chemistry of the corn kernel

The farm that won't wear out

The Farm That Won't Wear Out (Dodo Press)

The fertility in Illinois Soils

The Story of the Soil

The Story of the Soil from the Basais of Absolute Science and Real Life

The Story of the Soil from the Basais of Absolute Science and Real Life

The story of the soil, from the basis of absolute science and real life

The sugar beet in illinois