Physics 6351 Spring 2011
 Chapter 1 (pdf) of F. Reif, Statistical Physics.
(A general introduction to the statistical mechanics approach to macroscopic systems.
Password protected. You can also find the book in room 38A.)

I had a hard time following the comments in Ch 6 about Legendre Transforms;
I don't think they were completely correct. But here's an extended discussion
from a recent paper that you might find illuminating. As you know, it shows
up in Lagrangian/Hamiltonian mechanics as well as Thermodynamics:
Zia, Redish, McKay: Making Sense of the Legendre Transform (2009)
(c) Kent Hornbostel 2011
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