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1953

U.S.A. Physiographic.

World Atlas

U.S.A. Physiographic.

1873

United States Showing the Principal Geol …

World Atlas

Gray's Atlas Map of the United States Sh …

1874

Geological Formations of the United Stat …

World Atlas

Gray's Atlas Map of the United States Sh …

1878

Geological Map of the United States.

World Atlas

Gray's Geological Map of the United Stat …