Nachlässe und Autographen → Search Author / Collaborator = "Sigwart, Christoph, Sigwart, Christoph" and Collection = Nachlässe und Autographen
Nachlässe und Autographen → Search Author / Collaborator = "Sigwart, Christoph, Sigwart, Christoph" and Collection = Nachlässe und Autographen
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