"Hard-bound" was not a genre like "Hard-boiled," except with more bondage. In case you're curious. Of all those authors, only three seems remotely relevant to today, and of those three only one seems likely to maintain her audience for another few decades. And by "Audience" I mean "the name is familiar to people, mostly from movies and TV."

Interesting to see how the Diamond Match company had its own Good Housekeeping-style guarantee.