Columbia subject headings:
Harvard subject headings:
Diogenes (Firm : Zurich, Switzerland)--History--Correspondence.
Keel, Daniel--Correspondence.
Keel, Daniel--Friends and associates--Correspondence.
Publishers and publishing--Switzerland--Zurich--Correspondence.
Princeton subject headings:
Diogenes (Firm : Zurich, Switzerland)--History--Correspondence.
Keel, Daniel--Correspondence.
Keel, Daniel--Friends and associates--Correspondence.
Personal correspondence.
Publishers and publishing--Switzerland--Zurich--Correspondence.