Geothermal Gradient Map of North America (Sheet 1 of 2) [Map] Douglas M. Kinney and Research Committee of the American Association of Petroleum Geologists

1 map on 2 sheets :col. ;183 x 153 cm., sheets 102 x 161 cm

Depths shown by contours

"Prepared by the Geothermal Survey of North America, Subcommittee of the AAPG Research Committee."

Bipolar oblique conic conformal proj. (E 170 -- W 9/N 90 -- N 6)