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These pictures strongly remind me of "Ernst Haeckel: Kunstformen der Natur (Artforms of Nature) 1899-1904"

(unfortunately only the low resolution images (Bildschirmauflösung) are still available on the page)

All of these are in the public domain now, available in high resolution from here:

I've got several of these on my walls :)

There's a scan of an old edition on archive.org :