Columbia subject headings:
Children's literature, American--History and criticism.
Seuss, Dr.--Criticism and interpretation.
Harvard subject headings:
Children's literature, American--History and criticism.
Children--Books and reading--United States--History--20th century
Seuss, Dr.--Criticism and interpretation.
Princeton subject headings:
Children's literature, American--History and criticism.
Seuss, Dr.--Criticism and interpretation.