Penguin Books Ltd, Harmondsworth, Middlesex, England Penguin Books Australia Ltd, Ringwood, Victoria, Australia
First published by Alfred A. Knopf 1965 Published in Penguin Books 1967 Copyright © Scientific American Inc. 1965
The twelve chapters in ths book originally aapeared as articles in the September 1965 issue of Scientific American
Made and printed in Great Britain by
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