Columbia subject headings:
Authors, German--20th century--Biography.
Authors, German--Correspondence.
Landgrebe, Erich, 1908---Correspondence.
Harvard subject headings:
Authors, German--20th century--Biography
Authors, German--Correspondence
Landgrebe, Erich, 1908---Correspondence.
Princeton subject headings:
Authors, German--20th century--Biography.
Authors, German--Correspondence.
Landgrebe, Erich, 1908---Correspondence.