Download Ernst Haeckel's Kunst-Formen der Natur here- it's a 400 page, 260MB PDF file.

Public Domain, so feel free to share as much as you like!

Update: I found the original source of this PDF, located here - much thanks to Kurt Stüber for scanning this fantastic public domain book!

If you need to download it directly from my site:

www.origamitessellations.com/docs/Haeckel_Kunstformen.pdf

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