Columbia subject headings:
Igbo (African people)
Secularism--Nigeria.
Secularization (Theology)
Harvard subject headings:
Christianity--Africa
Christianity--Nigeria--20th century.
Igbo (African people)--Cultural assimilation.
Igbo (African people)--Religion.
Secularization (Theology)
Theology, Doctrinal.
Vatican Council (2nd : 1962-1965 : Basilica di San Pietro in Vaticano)
Princeton subject headings: