Long before we had cameras scientists still needed visual documentation—enter the science illustrator!

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Sources:
Vesalius
https://www.nlm.nih.gov/exhibition/sh...
http://www.metmuseum.org/art/collecti...
http://evolution.berkeley.edu/evolibr...

Maria Sibylla Merian
http://public.gettysburg.edu/~ketheri...
https://nmwa.org/explore/artist-profi...
http://www.getty.edu/art/exhibitions/...
http://penelope.uchicago.edu/Thayer/E...

Moses Harris
https://archive.org/details/Aurelian0...
http://web.mit.edu/22.51/www/Extras/c...
http://www.oxforddnb.com/index/12/101...
http://facweb.cs.depaul.edu/sgrais/co...

The Scott Sisters
https://australianmuseum.net.au/beaut...
https://australianmuseum.net.au/a-bio...

The Blaschkas
http://www.cmog.org/article/blaschkas...
http://blaschkagallery.mannlib.cornel...
http://hmnh.harvard.edu/glass-flowers

Beatrix Potter
http://www.bbc.com/earth/story/201602...
https://www.linnean.org/the-society/n...
https://books.google.com/books?id=7f6...

Ramón y Cajal
http://www.nobelprize.org/nobel_prize...
http://www.nobelprize.org/nobel_prize...
http://www.npr.org/sections/health-sh...
http://journal.frontiersin.org/articl...