Columbia subject headings:
Harvard subject headings:
Education, Elementary--United States
Education, Secondary--United States.
English language--Study and teaching--United States
Humanities--Study and teaching--United States.
Literature--Study and teaching--United States
Public schools--Curricula--United States.
Textbooks--United States.
Princeton subject headings:
Education, Elementary--United States.
Education, Secondary--United States.
Humanities--Study and teaching--United States.
Public schools--United States--Curricula.
Textbooks--United States.