Columbia subject headings:
Children--Books and reading--United States--Congresses.
Science--Study and teaching (Elementary)--United States--Congresses.
Harvard subject headings:
Children--Books and reading--Congresses
Science--Study and teaching (Elementary)--Congresses.
Princeton subject headings:
Children--Books and reading--United States--Congresses.
Science--Study and teaching (Elementary)--United States--Congresses.