Thanks, Richard - Roger's book was very helpful during my doctoral days, and I still have the hard copy on my bookshelf! Allan Allan H. Treiman Lunar and Planetary Institute 3600 Bay Area Boulevard Houston TX 77058 281-486-2117 -----Original Message----- From: Metamorphic Studies Group on behalf of Richard White Sent: Tue 3/30/2010 4:10 AM To: [log in to unmask] Subject: Powell 1978 book Hi all Roger Powell's 1978 book "Equilibrium Thermodynamics in Petrology" is now available online as a pdf. The file can now be downloaded from the thermocalc website: http://www.metamorph.geo.uni-mainz.de/thermocalc/ there are also a couple of new tutorials available. cheers, Richard -- Richard White Metamorphic Geology Institute of Geoscience Becherweg 21 University of Mainz Mainz D-55099 Germany Fax: +49 6131 39 23863 Phone: +49 6131 39 24781 Web: http://www.metamorph.geo.uni-mainz.de/englisch/e_index.html THERMOCALC web: http://www.metamorph.geo.uni-mainz.de/thermocalc/index.html