Columbia subject headings:
Ley-Piscator, Maria, 1905-
Piscator, Erwin, 1893-1966.
Theatrical producers and directors--Germany--Correspondence.
Harvard subject headings:
Ley-Piscator, Maria, 1905-
Piscator, Erwin, 1893-1966.
Theatrical producers and directors--Germany--Correspondence.
Princeton subject headings:
Piscator, Erwin, 1893-1966--Correspondence.
Theatrical producers and directors--Germany (West)--Correspondence.