Six mass market paperbacks, in laminated, illustrated light card covers. 12mos. Some gentle edge wear to card covers, a couple of mild reading creases. Internally a hint of page toning else neat, clean and tight.
A collection of Robert Heinlein's science fiction full length novels, the first six to be published. The Day After Tomorrow was later published under the title Sixth Column; Farmer in the Sky was also serialised in condensed form under the title Satellite Sky.