1. [Sigard Adolphus Knopf] Publication: 1932 Subject(s): Knopf, S. Adolphus (Sigard Adolphus), 1857-1940.
2. [Sigard Adolphus Knopf] Publication: Neufad, Germany. , 1932 Subject(s): Knopf, S. Adolphus (Sigard Adolphus), 1857-1940.