SMITHSONIAN EXPLORATIONS, I929 





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Fig. 35. — Collecting minerals at Pluto's Salt Pools, Death Valley. In these 

 natural " blow-holes " fine groups of salt and other crystals can be obtained. 

 ( Photograph by Foshag. ) 



Fig. 36. — Excavating for borax minerals in the floor of Death Valley. The 

 minerals are found in the mud at a depth of a few feet. (Photograph by 

 Foshag.) 



