Columbia subject headings:
Harvard subject headings:
Appalachian Mountains--Economic conditions.
Appalachian Mountains--Social conditions.
Economic assistance, Domestic--Appalachian Mountains.
Labor unions--Appalachian Mountains--Congresses.
Princeton subject headings:
Appalachian Region--Economic conditions--Congresses.
Appalachian Region--Social conditions--Congresses.
Labor supply--Appalachian Region--Congresses.