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The American midland naturalist - University of Notre Dame (University of Notre Dame, 1911)

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Archiv für Naturgeschichte. Abteilung B (Nicolai, 1917)

Archiv für Naturgeschichte (Nicolai, 1868)

Archiv für Naturgeschichte (Nicolai, 1872)

Archiv für Naturgeschichte (Nicolai, 1873)

Archiv für Naturgeschichte (Nicolai, 1877)