Well, this made me look up the history of the wheelchair. Okay, wow, yeah, I didn't know it was that old. Not sure if it would be good to link this in the pdf, but it's here at least.
https://blog.sciencemuseum.org.uk/history-of-the-wheelchair/
That's very cool! If I ever get around to doing a print run I'll update the PDF to add this link too. Thanks!
