Here's a quickie for a busy Monday morning. A few Tom Swift Books that I came across on Heritage Auctions. I do love colorful futuristic illustrations from the 50s and 60s. Looks like Tom had some very expensive toys.
These mystery and crime paperbacks from the 40s featured crime scene maps on the back and some wonderful cover illustrations, especially those by Gerald Gregg. There are lots of his covers here on Flickr.