I checked with them early on. We had taken several cases up right after it came out. They still have quite a few.
Sadly, no, he didn't sign them. Even when we had them at the political collectible shows, he din't sign unless asked.
I suppose I could sign them as the graphic artist, but it wouldn't add to the value. (Even though I spend as much time on image construction and layout as he did with the writing!) Actually, that book was how we justified getting a color laser printer. Having rough drafts printed at Kinko's (before they were FedEx Office) was getting expensive. We figured 2 copies there paid for the printer. That sucker got a workout, too.
Some of the images, like the pennant and truck on the front cover took hours to do. I had to scan the pennant in 3 separate pieces then stitch them together and do color matching. That was fun. (not).
The picture on the side of the truck was badly faded from all of the travelling. People think colorizing is work. Grey scale is just as hard to recreate. Then again, if I had the tools all of those years ago that are available now, it would have been a breeze.
There is an image on page 79 of a large poster done in red and black. Keep in mind that the poster, at this point, was 75 years old. The original poster was in pretty bad shape. Once I was able to scan the various pieces. I had to reassemble and color match. Once that was done, I had to recreate the missing pieces. I effectively had to do a complete digital reconstruction of the poster. I was really proud of that when it was done. Larry was, too.
I still have all of the original files, from writing drafts, image scans and the whole publication at various stages.