zoology / animal, amphibians, frogs, different frogs and stages, engraving, coloured, from "Meyers Konversations - Lexikon", Leipzig, Vienna, Germany, Austria, 1894,

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Keywords: 19th, amphibian, amphibians, animal, animals, century, coloured, engraving, frog, frogs, historic, historical, ranidae, spawn, stages, tadpole, tadpoles, zoology