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Geological Survey (U.S.)

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Boston and vicinity, Massachusetts : topography
Boston and vicinity, Massachusetts : topography

Map showing condition and progress of astronomic location, primary triangulation, primary traverse and precise leveling, for the fiscal year 1896-7.
Map showing condition and progress of astronomic location, primary triangulation, primary traverse and precise leveling, for the fiscal year 1896-7.

Map showing condition and progress of topographic surveys and location of gaging stations for the fiscal year 1896-7.
Map showing condition and progress of topographic surveys and location of gaging stations for the fiscal year 1896-7.

Hypsography of a part of the Ridged-Drift Area in North-Eastern Iowa
Hypsography of a part of the Ridged-Drift Area in North-Eastern Iowa

Superficial Formations of North-Eastern Iowa
Superficial Formations of North-Eastern Iowa

Primeval Forests and Swamps of North-Eastern Iowa
Primeval Forests and Swamps of North-Eastern Iowa

Indurated Formations of North-Eastern Iowa
Indurated Formations of North-Eastern Iowa

Hypsography of North-Eastern Iowa
Hypsography of North-Eastern Iowa

Map of the United States Showing the Progress of the Topographic Survey during the fiscal year 1889-90.
Map of the United States Showing the Progress of the Topographic Survey during the fiscal year 1889-90.

Preliminary Geologic Map of Maine
Preliminary Geologic Map of Maine