Columbia subject headings:
Great Britain--Emigration and immigration.
Ohio River Valley.
United States--Economic conditions.
Waste lands--Great Britain.
Harvard subject headings:
Great Britain--Emigration and immigration--Early works to 1800.
Great Britain--Emigration and immigration.
Ohio River Valley--Early works to 1800.
Ohio River Valley.
United States--Economic conditions--Early works to 1800.
United States--Economic conditions.
Waste lands--Great Britain--Early works to 1800.
Waste lands--Great Britain.
Princeton subject headings: