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The study of lattice varieties is a field that has§experienced rapid growth in the last 30 years, but many of§the interesting and deep results discovered in that period§have so far only appeared in research papers. The aim of§this monograph is to present the main results about modular§and nonmodular varieties, equational bases and the§amalgamation property in a uniform way. The first chapter§covers preliminaries that make the material accessible to§anyone who has had an introductory course in universal§algebra. Each subsequent chapter begins with a short§historical introduction which sites the original references§and then presents the results with complete proofs (in§nearly all cases). Numerous diagrams illustrate the beauty§of lattice theory and aid in the visualization of many§proofs. An extensive index and bibliography also make the§monograph a useful reference work.