"The Transition Period" by Josef Kuwasseg from Die Urwelt in ihren verschiedenen Bildungsperioden [The Primitive World in its Different Periods of Formation] by Franz Unger (1851)
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"The Transition Period" by Josef Kuwasseg from Die Urwelt in ihren verschiedenen Bildungsperioden [The Primitive World in its Different Periods of Formation] by Franz Unger (1851)