Two Books Remembered
The cover for The Grizzly, by Annabel and Edgar Johnson, always terrified me as a kid (better picture here). The story is a pretty good suspense novel, for being a youth fiction chapter-book.
Scholastic put this edition of Treasure Island in 1961, with Dom Lupo credited as the illustrator. Lupo falls into that internet cavern, in which his existence is out there (he also did a widely-printed golf book), but wasn't big enough for any fans to dedicate webpages to him in the 200s. As you can tell from those two books, my parents were fans of used books as well.