by Virginia Polytechnic Institute. Agricultural Extension Service

1923

by Virginia. Department of Agriculture

1889

by Thomas Whitehead, Virginia. Department of Agriculture

1898

by Virginia Agricultural Experiment Station

1909

by Virginia. General Assembly. House of Delegates

1922

by Virginia. State Entomologist and Plant Pathologist

1914

by Virginia. Office of the Attorney General

1921

by Virginia

1907

by Virginia Agricultural Experiment Station

1891

by Virginia. State Entomologist and Plant Pathologist

1910

by Virginia. Board of Crop Pest Commissioners

1901

by Virginia

1910