Stack of two hardcover technical textbooks offered as a single set: Molecular Thermodynamics of Fluid-Phase Equilibria (Prausnitz) and The Dynamic Behavior of Thermoelectric Devices (Paul E. Gray), published by John Wiley & Sons / The Technology Press and associated with the Prentice-Hall International series; both volumes show shelf wear to dust jackets with edge rubbing and scuffed corners, green cloth covers visible beneath jackets, intact bindings and solid spines, pages clean with typical age toning and no major tears (see photos for wear), sold together in Good condition; approximate packed stack dimensions used for shipping: 11 x 8.5 x 2.5 inches, estimated shipping weight 4 lb 8 oz.