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File:NAMrad Th let.gif

Summary

Description
English: Map of Thorium Concentrations (most of USA and some of Canada) from USGS Open-File Report 2005-1413
Date 2005
Source http://pubs.usgs.gov/of/2005/1413/NAMrad_Th_let.gif via http://pubs.usgs.gov/of/2005/1413/maps.htm
Author usgs.gov

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Public domain This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.

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