Columbia subject headings:
America--Emigration and immigration--History--Congresses.
America--Population--History--Congresses.
Indentured servants--America--History--Congresses.
Labor supply--America--History--Congresses.
Harvard subject headings:
America--Emigration and immigration--History--Congresses.
America--Population--History--Congresses.
Indentured servants--America--History--Congresses.
Labor supply--America--History--Congresses.
Princeton subject headings:
America--Emigration and immigration--History--Congresses.
America--Population--History--Congresses.
Indentured servants--America--History--Congresses.
Labor supply--America--History--Congresses.