Columbia subject headings:
Harvard subject headings:
Central High School (Philadelphia, Pa.)--History--19th century.
Central High School (Philadelphia, Pa.)--History--20th century.
High schools--Pennsylvania--Philadelphia--Curricula--History--19th century.
High schools--Pennsylvania--Philadelphia--Curricula--History--20th century.
Princeton subject headings:
Central High School (Philadelphia, Pa.)--History--19th century.
Central High School (Philadelphia, Pa.)--History--20th century.
High schools--Pennsylvania--Philadelphia--Curricula--History--19th century.
High schools--Pennsylvania--Philadelphia--Curricula--History--20th century.