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Kunstformen der Natur – Ernst Haeckel
Leipzig und Wien :Verlag des Bibliographischen Instituts,1904.

This work is from a beautiful blog called Scientific Illustration, which curates sketches, pages, field notes and other  images from the natural sciences as far back as the 1500s.  It’s a stunning collection, well worth visiting.  The curator also posts a constant stream via @lukaslarge on Twitter