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Wikipedia <br />http:// en.wikipedia.org/wiki/Insulator (electrical) <br />Wormington, H.M. <br />1956 A Reappraisal of the Fremont Culture_ Proceedings No. 1, The Denver <br />Museum of Natural History, Denver. <br />Young, Robert G. and Joann W. <br />1977 Colorado West, Land of Geology and Wildflowers. Wheelwright Press, Ltd. <br />22 <br />