Columbia subject headings:
Harvard subject headings:
Luzon (Philippines)--Social conditions.
Social mobility--Philippines (Republic)--Luzon.
Princeton subject headings:
Labor mobility--Philippines--Luzon--Case studies.
Land tenure--Philippines--Luzon--Case studies.
Landlord and tenant--Philippines--Luzon--Case studies.
Luzon (Philippines)--Rural conditions--Case studies.
Rural-urban migration--Philippines--Luzon--Case studies.