There were a bunch that got me started, when I was a kid. For about a year, when I was in 5th grade, I got a series of Science Service booklets that would arrive, I think monthly. They were in black and white, but each one came with a sheet of stamps that had the color illustrations. You would tear them out, lick them, and paste them into the book to make it complete. They had ones on space exploration that I pored over. The Edmund Deluxe Space Conqueror came with All About Telescopes. And I guess I have to count the 1968 catalog from which I bought it. In 6th grade I read Glass Giant of Palomar, and got the Astronomy merit badge book (I never finished the badge - Oregon weather made it challenging). That may be where I first saw a picture of the McMath solar telescope, which I thought was the coolest telescope on the planet (in 2009 I was on Kitt Peak for an educational program, and actually got to use it - to watch the sunset - I was absolutely thrilled to see the green flash through it). I also read everything I could find in our World Book Encyclopedia set (my mother sold them for a while) about astronomy. Sometime in middle school I got a copy of Norton's Star Atlas.
Since then, Leslie Peltier's Starlight Nights, Timothy Ferris' Galaxies, Howard's Telescope Handbook and Star Atlas, and strangely, Sidgwick's Amateur Astronomer's Handbook, which I somehow made myself read cover to cover. I have a couple of shelves worth of other books, but those are the ones that stand out.