The book "Nitrogen Bacteria and Legumes with Special Reference to Red Clover, Cowpea, Soybean, Alfalfa, and Honeysuckle on Illinois Soils" by Cyril G. Hopkins is devoted to the study of the interaction between nitrogen-fixing bacteria and various types of legumes of great agricultural importance. . The book examines the impact of these plants on soil quality, their contribution to soil nitrogen enrichment and productivity. The author analyzes the impact of different types of leguminous crops on improving soil quality and recommends optimal practices for growing each type of crop. The book is a valuable source of information for scientists, farmers and students interested in agronomy and crop production.