Columbia subject headings:
Water and civilization.
Water in literature.
Water--Mythology--Portugal.
Water--Mythology--Spain.
Water--Portugal--Folklore.
Water--Spain--Folklore.
Harvard subject headings:
Water and civilization.
Water in literature.
Water--Mythology--Portugal.
Water--Mythology--Spain.
Water--Portugal--Folklore.
Water--Spain--Folklore.
Princeton subject headings:
Water and civilization.
Water in literature.
Water--Folklore.
Water--Mythology--Portugal.
Water--Mythology--Spain.