The Rare Earths, by S. I.
   Levy                                           62923
     [Subtitle: Their Occurrence, Chemistry, and Technology]
     [Link: http://www.gutenberg.org/6/2/9/2/62923 ]
     [Files: 62923-0.txt; 62923-h.htm]
   Thanks to deaurider, Harry Lamé and the Online Distributed
   Proofreading Team at https://www.pgdp.net (This file was
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   Chuck