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Titles
- [Sigard Adolphus Knopf]23
- [S. Adolphus Knopf]8
- [Dr. S. Adolphus Knopf]7
- [Collection of Group Portraits]2
- [S. Adolphus Knopf and others]2
- [S.A. Knopf with patient]2
- S.A. Knopf: Associationi Inter Nationes Contra Tuberculosim Constitutae1
- [S. Adolphus Knopf and assistants]1
- [S.A. Knopf and others]1
- [Sigurd Adolphus Knopf]1