December 1972 5th printing November 1971 15th printing January 1973 11th printing July 1972 21st printing January 1973 6th printing March 1972 16th printing January 1973 10th printing May 1972 20th printing January 1973 9th printing April 1972 17th printing January 1973 9th printing April 1972 17th printing January 1973 9th printing April 1972 18th printing January 1973 22nd printing 23rd printing All rights reserved. Copyright 1968 Econ-Verlag GmbH. Translation copyright 1969 by Souvenir Press Ltd. Universe Book
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