Columbia subject headings:
Harvard subject headings:
Authors, German--Intellectual life--21st century.
Frommel, Wolfgang, 1902-1986--Friends and associates.
Frommel-Haverkorn van Rijsewijk, Joke, 1935-
George, Stefan, 1868-1933.
Stichting Castrum Peregrini.
Princeton subject headings:
Authors, German--Biography.
Frommel, Wolfgang, 1902-