Thermodynamics & Statistical Mechanics

Beginner

Concepts in Thermal Physics Blundell & Blundell

Easy

Thermal Physics Daniel V. Schroeder

Medium

Thermal Physics Kittel & Kroemer

Hard

Fundamentals of Statistical and Thermal Physics F. Reif Statistical Mechanics R. K. Pathria & Paul Beale

Extreme

Thermodynamics and an Introduction to Thermostatistics Herbert B. Callen