Columbia subject headings:
Stramm, August, 1874-1915--Correspondence.
Walden, Herwarth, 1878-1941--Correspondence.
Walden, Nell--Correspondence.
Harvard subject headings:
Authors, German--20th century--Correspondence
Stramm, August, 1874-1915--Correspondence.
Walden, Herwarth, 1878-1941--Correspondence.
Walden, Nell--Correspondence.
Princeton subject headings:
Stramm, August, 1874-1915--Correspondence.
Walden, Herwarth, 1878-1941--Correspondence.
Walden, Nell--Correspondence.