Twentieth Annual report of the United States Geological Survey, 1898-1899: Part I - Director's Report Including Triangulation and Spirit Leveling (Q137384)

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Twentieth Annual report of the United States Geological Survey, 1898-1899: Part I - Director's Report Including Triangulation and Spirit Leveling; 1899; AR; 20; Walcott, Charles D.
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Twentieth Annual report of the United States Geological Survey, 1898-1899: Part I - Director's Report Including Triangulation and Spirit Leveling
Twentieth Annual report of the United States Geological Survey, 1898-1899: Part I - Director's Report Including Triangulation and Spirit Leveling; 1899; AR; 20; Walcott, Charles D.

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