Uraniumand ThoriumResources. Table 4 Temperature distribution depth parameter

From: Uranium and Thorium Resources

Location	h_r (m)
Sierra Nevada	10,000
Eastern USA	7,500
Norway and Sweden	7,200 ± 700
Eastern Canadian Shield	7,100 ± 1,700
Canadian Appalachians	10,000 ± 2,000
US Appalachians	8,100 ± 1,300

In the other references the depth parameter is denoted as D, rather than h_r

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