Andrew Wyeth, from Andrew Wyeth: Close Friends:

While I was recovering from lung surgery, Adam came over to see me on his tractor – the only vehicle he owned. “I didn’t send you any flowers, so I’ve come to set so you can sight me.” This is the drawing I did.

“Adam Johnson” 1951

I couldn’t find a decent picture of this online so I took a photo of a page in my book. Well, not my book, the library’s book.