Specimens of the plants and fruits of the island ... v.3+. Wollstonecraft, Anne Kingsbury. C.1826 https://hdl.handle.net/2027/coo.31924100271489
From https://www.hathitrust.org - seems to allow download of full manuscripts
Beetles: https://archive.org/details/mobotbca_12_06_01s/page/1 Via https://www.cunicode.com/works/confusing-coleopterists
https://www.metmuseum.org/art/metpublications/titles-with-full-text-online?searchtype=F
https://publicdomainreview.org/collections/the-trouvelot-astronomical-drawings-1882/
Cellarius is also a great name
Publicdomainreview.org in general seems great, right up your alley
https://www.oldbookillustrations.com/ via http://www.openculture.com/2020/02/old-book-illustrations-download.html via https://news.ycombinator.com/item?id=22315694