Columbia subject headings:
Authors, German--20th century--Biography--Sources.
Frank, Leonhard, 1882-1961--Criticism and interpretation.
Frank, Leonhard, 1882-1961.
Mühsam, Erich, 1878-1934.
Harvard subject headings:
Authors, German--20th century--Biography--Sources.
Frank, Leonhard, 1882-1961
Frank, Leonhard, 1882-1961--Criticism and interpretation.
Mühsam, Erich, 1878-1934.
Princeton subject headings:
Authors, German--20th century--Biography--Sources.
Frank, Leonhard, 1882-1961--Criticism and interpretation.
Frank, Leonhard, 1882-1961.
Mühsam, Erich, 1878-1934.