Columbia subject headings:
Authors, American--20th century--Correspondence.
Manfred, Frederick Feikema, 1912-1994--Correspondence.
Harvard subject headings:
Authors, American--20th century--Correspondence
Manfred, Frederick Feikema, 1912-1994--Correspondence.
Princeton subject headings:
Authors, American--20th century--Correspondence.
Manfred, Frederick Feikema, 1912-1994--Correspondence.