"This book explores modern thermodynamics of crystalline states, through the lens of soliton theory. Right from the start, the book revises traditional theories of these concepts with soliton theory in mind. Although well-established as a mathematical nonlinear physics, this is the first time that a book uses soliton theory to deal with nonlinear processes in crystals, clarifying dynamical aspects logically, as demonstrated for superconductivity in modulated crystals. The book explores the soliton theory of crystalline processes, from irreversible processes in Crystals, to Phase Transitions and Mesoscopic Disorder, Statistical Thermodynamics of Modulated Lattices, and Superconductivity"--