Columbia subject headings:
Fritz-Hüser-Institut für Literatur und Kultur der Arbeitswelt--History.
Hüser, Fritz--Correspondence.
Librarians--Germany--Dortmund--Correspondence.
Library directors--Germany--Dortmund--Correspondence.
Harvard subject headings:
Hüser, Fritz--Correspondence.
Librarians--Germany--Correspondence.
Princeton subject headings:
Fritz-Hüser-Institut für Literatur und Kultur der Arbeitswelt--History.
Hüser, Fritz--Correspondence.
Librarians--Germany--Dortmund--Correspondence.
Library directors--Germany--Dortmund--Correspondence.