Geological Survey Professional Paper, Issues 217-218

Front Cover
U.S. Government Printing Office, 1950

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Contents

Map showing configuration of bedrock surface in the District of Columbia region In pocket 2 Map showing depth to bedrock in part of Washington ...
2
A Gravel of Potomac group on gneiss Harvard Street east of entrance to Zoological Park B Plateau gravel
3
JJedrock contacts
5

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