Pliolograph by Riser 



A SAPPHIRE IN A MOUNTAIN SETTING: BLUE LAKE IN THE GLACIER 



NATIONAL PARK 

 What American engineers have done at Gatun. glaciers have done in our high mountains. A glacier 

 lake is often a dam-obstructed river, the dam being built out of the earth-shavings resulting from the 

 flowing onward sweep of the mountains of ice. 



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