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*Rana temporaria*, development of the frog, set of 25 wax models in three perspex topped boxes. Ziegler Serie 25

Germany CRE ZIEGLER Adolph after Alexander Ecker 1852 Freiburg, Germany Legend in the Ziegler catalogue reads - 'Entwicklung der Frosches, 25 modelle. Nach. Prof Dr. A. Ecker'.