Farmers' Bulletin: Issue 1779

Selenium Occurrence in Certain Soils in the United States with a Discussion of Related Topics: Third Report, Issues 601-625

Wheat Requirements in Europe: Especially Pertaining to Quality and Type, and to Milling and Baking Practices, Issues 526-550

A Revision of the Mites of the Subfamily Tarsoneminae of North America, the West Indies, and the Hawaiian Islands: Issues 651-675