Can you fix this cartoon?

I'm completely helpless. Nowhere in X5 can I find a tool that will un-warp this cartoon. I really want this cartoon. If I knew what book he put it in, I'd buy the book.

This is a John McPherson Close to Home cartoon from September 7, 1993. Apparently, there are just two of these on the entire Internet. One is warped, one is a lousy photocopy or fax.

Here is the largest version I've seen online:

http://1.bp.blogspot.com/-HmHTuGHcerM/TeMCGmisMWI/AAAAAAAAAYA/dLW-kcfwagA/s1600/DSC_3097.JPG

I tried to fix it with GIMP. I get it looking a little better with a combination of the Curve Bend Filter and Perspective Tool, but never perfect.

I think there may be some sort of plugin for X5 that can do this sort of thing, but I don't have it, as the link I saw went nowhere.

The image appears to have the entire right side sheared off. That's not my doing—these forums are doing that every time I post the picture, even when I edit it smaller than the stated requirements.

 

Thanks!