I found this auction on eBay.

The cover for Sixth Column is by Edd Cartier whose art I am collecting.

I thought that $1500 might be a little much for books, but I did some research and it is not that far off. The juveniles had a large printing and most are available on alibris.com for under $100 each, and all are very cheap if you are willing to go ex-libris. Sixth Column is only the dust jacket, but it may be the rarest of the six and most valuable. You can’t find any Door Into Summer first editions, so that might be valuable.

I will watch this auction. If these books do well, at least I’ll know I can sell some of my library and be able to buy cat food. (My retirement portfolio is down around $19,000 for the day at this moment.)

I have the same editions of 4 out of these 6, but only two of mine have dust jackets. I own The Star Beast, The Rolling Stones, The Green Hills of Earth, and and Rocket Ship Galileo, but only have a DJ for Rolling Stones and Green Hills of Earth. I bought all at flea markets for about $1 each.