Columbia subject headings:
Avesta--Criticism, interpretation, etc.
Iran--Social life and customs.
Soils--Religious aspects--Zoroastrianism.
Harvard subject headings:
Avesta--Criticism, interpretation, etc.
Iran--Social life and customs.
Soils--Moral and ethical aspects.
Princeton subject headings:
Avesta--Criticism, interpretation, etc.
Iran--Social life and customs.
Soils--Religious aspects--Zoroastrianism.