Denying any responsibility for this is: Treehugger
The author writes:
Oh yes, I know some people will complain that I used a photo and just painted over the edges a bit. They will tell me this is lazy. But do you know how long it took me to locate this simple photograph? These things are outrageously rare by now, and there are absolutely no good pictures of them on the Internet. I actually had to go to the local library, locate a catalogue and photocopy the page.
In short, it would have been a lot less work if I had simply drawn it to the best of my recollection.