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History of Beads and Beadwork information:

Links:
Encarta Reference: Beads
The Bead Site
Info about Zulu Beadwork
Info about Native American Beadwork
Lapidary Journal article on Pakistani beadmaking history and techniques

Books:
Bodyguards-Protective Amulets and Charms by Desmond Morris
Gem Stones-The visual guide to more than 130 gemstone varieties by Cally Hall
The History of Beads-From 30,000 B.C. to the Present by Lois Sherr Dubin