Columbia subject headings:
Adult education--United States--Statistics.
Educational surveys--United States.
Functional literacy--United States--Statistics.
Harvard subject headings:
Adult education--United States.
Educational surveys--United States.
Functional literacy--United States.
National Adult Literacy Survey.
Princeton subject headings:
Adult education--United States.
Educational surveys--United States.
Functional literacy--United States.
Literacy--United States.
National Adult Literacy Survey.