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Text-book of embryology - Heape, Walter, 1855 -1929 (Macmillan, 1914)

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Das Thierreich, geordnet nach seiner Organisation : als Grundlage der Naturgeschichte der Thiere und Einleitung in die vergleichende Anatomie - Cuvier, Georges, baron, 1769 -1832 (F.A. Brockhaus, 1836)

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