Sorry to pollute the original post subject but I think that could be of common interest
made an online search
On project guthemberg site (a collection of copyright free ebooks) there are alot of good pottery free downladable ebooks.
you can read them on the site too without download.
google for project guthemberg then search for this titles:
A Study of Pueblo Pottery as Illustrative of Zuņi Culture Growth. by Cushing
Origin and Development of Form and Ornament in Ceramic Art. by William Henry Holmes
History of Ancient Pottery. Volume 1 (of 2) by H. B. Walters
History of Ancient Pottery. Volume 2 (of 2) by H. B. Walters
Pottery, for Artists, Craftsmen & Teachers by George James Cox
Pottery of the ancient Pueblos. (1886 N 04 / 1882-1883 (pages 257-360)) by Holmes
Ancient Pottery of the Mississippi Valley by William Henry Holmes
Ancient art of the province of Chiriqui, Colombia by William Henry Holmes
Mohave Pottery by Michael J. Harner and A. L. Kroeber