We now have the knowledge to 'iron' them out.
Not possible. These were printed on terrible, terrible cardboard stock, and it's very, very difficult to find a copy, any copy, that isn't split someplace along the spine. As well, the cardboard is absolutely unforgiving, and whereas with a newsprint cover, or even a Baxter cover, there was a bit of "give" and flexibility to the spine so that stress didn't always result in permanent damage along the pressure line, with cardboard, there was no such flexibility. Once you bent cardboard, it stayed bent, permanently, no matter how you might try to "iron it out."