Generally octavo in size, perfect bound, stapled or comb bound affairs, many with questionable production values—but they were quite affordable ($5-$15). There was the occasional hardbound book (at premium prices, about $15-$25), and many of the older books (those not yet reprinted by
Dover) were hardbound as well. But the majority of the new stuff was inexpensively produced (keep in mind that there were, of course, many exceptions).
Sometime in the late 1970s somebody got the wild notion that magic books could be better—a lot better: Quarto in size, quality boards and acid-free paper with prices that matched this premium level of quality. Pretty soon everyone was in the big-book, big-price ($35-$45) business. Hardbound books in...