[j. d. worthington]

There are two I'd add a caution about, though I think they're still worth reading; but they're not nearly as good as Heinlein can be: Rocketship Galileo (1947) and Sixth Column (a.k.a. The Day After Tomorrow; serial 1941; book 1949). The first was his first juvenile, and is quite wobbly. Some brilliant stuff in there, and some that was definitely "written with his left hand", as it were. Sixth Column was written at the behest of John W. Campbell, and was a project Heinlein was less than enthusiastic about and, again, it shows....