Columbia subject headings:
Harvard subject headings:
Althaus, Peter Paul, 1892-1965--Correspondence.
Althaus, Peter Paul, 1892-1965--Diaries.
Authors, German--20th century--Correspondence
Authors, German--20th century--Diaries
World War, 1914-1918--Personal narratives, German
World War, 1939-1945--Personal narratives, German.
Princeton subject headings:
Althaus, Peter Paul, 1892-1965--Correspondence.
Althaus, Peter Paul, 1892-1965--Diaries.
Authors, German--20th century--Correspondence.
Authors, German--20th century--Diaries.
Diaries.
Poetry.
World War, 1914-1918--Personal narratives, German.
World War, 1939-1945--Personal narratives, German.