Columbia subject headings:
Anarchists--Germany--Correspondence.
Authors, German--20th century--Correspondence.
Mühsam, Erich, 1878-1934--Correspondence.
Harvard subject headings:
Anarchists--Germany--Correspondence.
Authors, German--20th century--Correspondence
Mühsam, Erich, 1878-1934--Correspondence.
Princeton subject headings:
Anarchists--Germany--Correspondence.
Authors, German--20th century--Correspondence.
Mühsam, Erich, 1878-1934--Correspondence.
Mühsam, Kreszentia, 1884-1962--Correspondence.