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Geological Survey (U.S.)

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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


Preliminary Geologic Map of Maine
Preliminary Geologic Map of Maine


Portland: produced for the United States Geological Survey
Portland: produced for the United States Geological Survey


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