by Wendell A. Duffield
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Tapping the earth's natural heat
Geothermal energy
Chasing Lava
From Piglets To Prep School
Geology of the Sierra foothills melange ...
The Geothermal Research Program of the U...
Feldspar minerals
Stereograms for the determination of pla...
The determination of the feldspars in th...
Zircon
Hydrothermal differentiation and myrmeki...
Emplacement of quartz-feldspar veins in ...