The book "Upper mantle rocks from Kozákov and Horní Bory, Bohemian Massif" offers a comprehensive geochemical analysis of upper mantle rocks, particularly peridotites, and highlights their development from the Archean era to the present. It examines the crucial role that mantle processes play in the formation of continents and their influence on the geochemical properties of the Earth's crust. The study focuses on two specific locations in the Bohemian Massif, Kozákov and Horní Bory, which were selected for their unique mantle samples. These sites provide deeper insights into processes such as mantle depletion, metasomatism, and the interactions between melt and rock. The book is aimed at professionals and enthusiasts interested in the geochemistry of the upper mantle.