If you can find a copy "Copper for America" Charles K Hyde, 1998 University
of Arizona Press in Tucson is perhaps the most recent thing out. He is not
too good however and I have been disapointed in his treatment of Arizona and
the 20th century.
Turquoise in the Americas, Scientific American, FEb. 1992, p. 84 has a great
article on how Western US turquoise ended up in Aztec Masks from the Spanish
explorations of the 1500 that were traded throughout Europe.
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