Dell F-375; copyright 1966; size MMPB. Contains: 1. "Pandora's Box", aka "Where To?" Originally published in 1952, one of Heinlein's earlier discussions of the art and purposes of SF writing. 2. "Free Men". No separate copyright stated; thus, apparently first published in this collection. 3. "Blowups Happen", copyright 1940. A story of things going wrong in a nuclear factory. 4. "Searchlight", copyright 1962. 5. "Life-Line", copyright 1939. 6. "Solution Unsatisfactory", copyright 1940. A story of a wartime invention of radioactive dust instead of nuclear weapons; things still go wrong. 192 pp. Book pre-dates ISBN but has cover as shown. Original price in 1966 was 40 cents.

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