re: I spent a while today reading a bunch of Jo Walton's reviews on tor.com. This included a bunch of Heinlein; she's a fan.
@anthracite I read "Tunnel in the Sky" at the library in the early 90s, and "Red Planet" my parents owned. When I was old enough, they let me read "Stranger in a Strange Land." Then in my teens I found "Number of the Beast". And I think that's still everything of his that I've read, minus a short story or two. One or two things from every period of his writing, apparently, and more or less in order.