One of the books that "got away"was called Ark of Venus by Clyde B. Clason. In, oh, third or fourth grade, I moved to a new school where we participated in something called the SRA reading program. One of the books was Ark of Venus. I remember reading it and the descriptions of the jungles of Venus and the wacky space monkey they found. But I never finished reading it. I think we moved again before I got to the end, or the semester ended, I don't know the reason, but I didn't get to find out what happened to the intrepid space family and their space monkey in the jungles of Venus.
Flash forward to post-college and I mention this book to my friend Clif who, it turns out, remembered reading the same book when he was a kid. I was in Houston by then and I decided to see if I could find it at the library. They actually had a copy in the stacks, dug it out and let me borrow it. I read it. And now it's on my list of books read.
Sadly, it's now been another 15 years since I read it in Houston and I still couldn't tell you how it ended.
Amazing how, thanks to the miracle of the internet, I can find an image of the cover of this obscure book.