Arts and Crafts Cooperative, Inc. in Berkeley:  http://www.accigallery.com/

The Highlight Gallery in Mendocino  http://www.thehighlightgallery.com/

Pottery Facebook Page:  http://www.facebook.com/sequoia.pottery

Etsy,  https://www.etsy.com/shop/SlickfootClayTools

Association of California Ceramic and Glass Artists:  http://www.acga.net/

San Joaquin Clay and Glass Association:  http://www.sjcga.com/

Purchase "Macro-Crystalline Glazes: The Challenge of Crystals" (I have a section in it) at:http://www.amazon.com/Macro-Crystalline-Glazes-Challenge-Peter-Ilsley/dp/1861261209 

This is the "States of Matter" section of the Kahn Acadamy.  All glazes at some point in the firing/cooling exist in two or more of these states.    http://www.khanacademy.org/science/chemistry/states-of-matter/v/states-of-matter  another is http://ceramicartsdaily.org/ceramic-glaze-recipes/glaze-chemistry-ceramic-glaze-recipes-2/how-glazes-melt-in-search-of-the-elusive-eutectic/ , by Dave Finkleinburg

About Giant Sequoia National Monument,  https://en.wikipedia.org/wiki/Giant_Sequoia_National_Monument 

 http://www.fs.usda.gov/main/sequoia/home

 Crystalline Glaze Forum, a discussion group generally on topics related to zinc silicate crystalline glazes: http://crystalglaze.freeforums.net/