Columbia subject headings:
Educational surveys.
Labor productivity.
Literacy--Economic aspects--Statistics.
Literacy--Government policy.
Reading--Statistics.
Harvard subject headings:
Educational surveys.
Labor productivity.
Literacy--Economic aspects--Statistics.
Literacy--Government policy
Reading--Statistics.
Princeton subject headings:
Educational surveys.
Labor productivity.
Literacy--Economic aspects--Statistics.
Literacy--Government policy.
Reading--Statistics.