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Are you Carl Sapper, author of the books below?
The Old Indian Settlements and Architectural Structures in No... by Sapper Karl 1866-1945 Über die Geologischen Verhältnisse des Juifen und Seiner Umge... by Carl Sapper Das Nördliche Mittel-Amerika Nebst Einem Ausflug nach dem Hoc... by Carl Sapper Uber Gebirgsbau Und Boden Des Nordlichen Mittelamerika (1899) by Carl Sapper Das nördliche Mittelamerika by Carl Sapper Das Nordliche Mittel-Amerika Nebst Einem Ausflug Nach Dem Hoc... by Karl Sapper Mexican and Central American Antiquities, Calendar Systems an... by Eduard Seler


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