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Online Books by

Christian Herrgen

Books from the extended shelves:

• Herrgen, Christian: Descripción geognóstica de las rocas que componen la parte sólida del globo terrestre : extractada de varias obras alemanas de la Escuela de Werner, y aumentada con observaciones hechas en la peninsula (Imprenta Real, 1802), also by Imprenta Real (Madrid) (page images at HathiTrust)
• Herrgen, Christian: La orictognósia (en la Imprenta Real :, 1797), also by Johann Friedrich Wilhelm Widenmann, Francisco Guerra, Pedro Julián Pereyra, and Imprenta Real (Madrid) (page images at HathiTrust)

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