Columbia subject headings:
Education, Secondary--Curricula--United States--Statistics.
Postsecondary education--Curricula--United States--Statistics.
Vocational education--United States--Statistics.
Harvard subject headings:
Education, Secondary--United States--Curricula--Statistics.
Postsecondary education--United States--Curricula--Statistics.
Vocational education--United States--Statistics.
Princeton subject headings:
Education, Secondary--United States--Curricula--Statistics.
Postsecondary education--United States--Curricula--Statistics.
Statistics.
Vocational education--United States--Statistics.