Insulation effect of black feathers on snow, verso Image Read more about Insulation effect of black feathers on snow, verso
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Snow drift around survey station, copy 6, verso Image Read more about Snow drift around survey station, copy 6, verso
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Overhead view of snow station equipment, copy 1 Image Read more about Overhead view of snow station equipment, copy 1
Portrait of Dr. Church with height, copy 2 Image Read more about Portrait of Dr. Church with height, copy 2
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