File:USGS Professional Paper 144, Plate 6.jpg
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![File:USGS Professional Paper 144, Plate 6.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/8a/USGS_Professional_Paper_144%2C_Plate_6.jpg/800px-USGS_Professional_Paper_144%2C_Plate_6.jpg?20230519182458)
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