Columbia subject headings:
Harvard subject headings:
Catholic Church. Pope (1978-2005 : John Paul II). Laborem exercens.
Igbo (African people)--Social life and customs.
Nigeria--Social life and customs.
Work.
Princeton subject headings:
Catholic Church. Pope (1978-2005 : John Paul II). Laborem exercens.
Igbo (African people)--Social life and customs.
Nigeria--Social life and customs.
Work.