for the Heinlein Fan...
Heinlein's wife published many of his letters posthumously. They start in '39 and span his career.
Letters written by Robert Heinlein published posthumously (as was his wish). From the back cover: "Here are his most personal thoughts and opinions on publishers, travel, juvenile novels, adult novels, work habits, fan mail, housebuilding and its demands and frustrations, reviews, and his writing methods, as well as the ethics he saw in writing good science fiction."