Printing History
A Berkley Medallion Book published by Berkley Publishing Corporation.  Copyright 1961.  Published by arrangement with G.P. Putnam's Sons.  Berkley Medallion Edition, March, 1968.  (No indication of which printing.)  The price of the book was 95¢.

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Long after I created this website, I saw this book (along with two other Heinlein books) on eBay and bid on it just to get the different cover. Needless to say, I won the bid.

The quotes on the back cover are a longer version of the one on the front of the 1962 cover and the same as on the back of the 1967 cover.