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Donation and Depreciation Lands in Pennsylvania
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Map illustrating Donation and Depreciation Lands in Pennsylvania.

Credit: W.J. McKnight, M.D., A Pioneer Outline History of Northwestern Pennsylvania, J. Lippincott Co., 1905. Courtesy of Accessible Archives.

When General William Irvine in 1785 surveyed the Donation Lands in what would become Warren County, it was a vast territory occupied by the Seneca and other Indians. Even today, over half of Warren County is in the Allegheny National Forest, the only national forest in Pennsylvania.

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