The National Geographic Magazine, Volume 68National Geographic Society, 1936 - Geography Indexes kept up to date with supplements. |
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Page 250
... GYPSUM TO THE SURFACE Underlying the Tularosa Basin are beds . of Permian limestone and sandstone , be- tween the layers of which are interspersed thick beds of gypsum . Borings made in recent years reveal that the gypsum is hun- dreds ...
... GYPSUM TO THE SURFACE Underlying the Tularosa Basin are beds . of Permian limestone and sandstone , be- tween the layers of which are interspersed thick beds of gypsum . Borings made in recent years reveal that the gypsum is hun- dreds ...
Page 260
... gypsum ocean presents an ever - changing appearance because of the continual drifting and , at nightfall , the shadows that come and go . The San Andres Mountains , on the west side of the Tularosa Valley , are silhouetted on the ...
... gypsum ocean presents an ever - changing appearance because of the continual drifting and , at nightfall , the shadows that come and go . The San Andres Mountains , on the west side of the Tularosa Valley , are silhouetted on the ...
Page 264
... gypsum . When natural gypsum is dehydrated by heat , it becomes the quick - setting cement known as " plaster of paris . " About four million tons of this calcined gypsum are used each year for wall plaster or stucco . Plate - glass ...
... gypsum . When natural gypsum is dehydrated by heat , it becomes the quick - setting cement known as " plaster of paris . " About four million tons of this calcined gypsum are used each year for wall plaster or stucco . Plate - glass ...
Contents
An Unspoiled Patch of Polynesia Is Niuafoō Nicknamed Tin | 91 |
National Geographic Society Honors Byrd Antarctic Expedition | 107 |
A Pacific Island Provides the Palms Which Decorate Hotels | 115 |
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