1. [Sigard Adolphus Knopf] Publication: New York. , 1914 Subject(s): Knopf, S. Adolphus (Sigard Adolphus), 1857-1940.
2. [Dr. S. Adolphus Knopf] Publication: 1914 Subject(s): Knopf, S. Adolphus (Sigard Adolphus), 1857-1940.