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1878

(Map 7 - Iowa, Indiana, Illinois, Michig …

Case Map

(Map 7 - Iowa, Indiana, Illinois, Michig …

1883

E. United States 5.

World Atlas

Eastern United States. No. 5. Letts's po …

1931

Soil Map of the United States, Section 7 …

National Atlas

Soil Map of the United States by Curtis …