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* [http://www.umassd.edu/cvpa/universityartgallery/ernsthaeckel.html University Art Gallery, University of Massachusetts Dartmouth] - An Ernst Haeckel exhibition from 2005 pairing prints from ''Kunstformen der Natur'' with modern sculptures.
* [http://caliban.mpiz-koeln.mpg.de/~stueber/haeckel/kunstformen/liste.html Kurt Stüber's Biolib] - An online version of ''Kunstformen der Natur'' with 300 dpi scans of the 100 plates, their scheme plates, the accompanying description, table of contents and supplement pages.
* {{citar ref-web|url=http://algorithmic-worlds.net/Haeckel/haeckel.php|títol=Kunstformen der Natur<!--Títol generat per bot-->}} - Zoomable pictures of the hundred plates of "Kunstformen der Natur" (requires flash).
* [http://caliban.mpiz-koeln.mpg.de/haeckel/kunstformen/Haeckel_Kunstformen.pdf ''Kunstformen der Natur'']
 
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