Columbia subject headings:
Great Britain--Colonies--America.
Labor supply--United States--History.
Slavery--United States--History.
United States--Emigration and immigration.
United States--History--Colonial period, ca. 1600-1775.
Harvard subject headings:
Great Britain--Colonies--America--Economic conditions.
Indentured servants--United States--History.
Labor supply--United States--History.
Slavery--United States--History
United States--Economic conditions--To 1865.
United States--History--Colonial period, ca. 1600-1775.
Princeton subject headings:
Great Britain--Colonies--America.
Labor supply--United States--History.
Slavery--United States--History.
United States--Emigration and immigration.
United States--History--Colonial period, ca. 1600-1775.