Columbia subject headings:
Harvard subject headings:
Friedrich, Walter, 1929---Interviews.
Youth--Germany (East)
Youth--Research--Germany (East)
Zentralinstitut für Jugendforschung--History.
Zentralinstitut für Jugendforschung.
Princeton subject headings:
Friedrich, Walter, 1929---Interviews.
Interviews.
Youth--Germany (East)
Youth--Research--Germany (East).
Zentralinstitut für Jugendforschung.