Notes: "Previous Dell Edition #7948" corresponding to catalogue number of 19748 on front cover. "First printing - January 1970" "Fifth printing - January 1971" "Tenth printing - March 1972" "Fifteenth printing - May 1973" "Twentieth printing - February 1974" "Twenty-fifth printing - May 1976" "Twenty-sixth printing - October 1976" "Twenty-seventh printing - March 1977" "Twenty eighth printing - September 1977" "Twenty-ninth printing - November 1977" "Printed in the U.S.A."