Competition between soybeans and other crops in major U.S. regions /

Mode of access: Internet.

Breeding perennial forage grasses /

Literature cited: p. 100-116.

The feeding of crops and stock; an introduction to the science of the nutrition of plants and animals,

Mode of access: Internet.

California vegetable crops.

Mode of access: Internet.

Southern crops as grown and described by successful farmers,

Mode of access: Internet.

The great world's farm; some account of nature's crops and how they are grown,

2d ed.