Wow. Of course, I am of an age such that I read a ton of those books as a child. Though, if I’m honest, I read more of the Endless Quest books, which were put out by TSR, the parent company of Dungeons & Dragons (fantasy), Gamma World (post-apocalyptic), and Star Frontiers (science fiction). I actually bought one of those at the Royal Oak Bookshop in Front Royal, Virginia (my father and I took a trip there to celebrate his birthday).
But, this man started all that was either directly or indirectly responsible for dozens of such books that the elementary school version of myself relentlessly plowed through.
Alas, poor Yorick!