Cowen, Richard 1999. The Age of Iron Chapter 5 in a series of essays on geology, history, and people prepared for a course of the University of California at Davis. Online versionArchived 2010-03-14 at the Wayback Machine.
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Cowen, Richard 1999. The Age of Iron Chapter 5 in a series of essays on geology, history, and people prepared for a course of the University of California at Davis. Online versionArchived 2010-03-14 at the Wayback Machine.