The purpose of this publication is to summarize the recent knowledge regarding the formation and significance of the great soil groups in the United States for the general reader. The treatment is in no sense complete or exhaustive. Attention is directed toward a discussion of those principles in broad implication. Should the reader require more specificity, the detailed reports of surveys and researches must be consulted.

This publication is the fourth in a series designed to aid in the recognition and identification of pathological conditions of economic importance affecting fruits and vegetables in the channels of marketing, to facilitate the market inspection of these food products, and to prevent losses from such conditions.

Part of a series of detailed reference manuals on American economic history, this volume traces the development and expansion of agriculture across the USA during the last half of the 19th century.

A collection of 14 discussions of the past and present literature about soil science. The topics include a historical survey, bibliometrics, introduction into developing countries, societies and their publishing influence, information systems, core monographs, primary journals, maps, and other aspec