Keisuke Izawa ; tr. from Japanese by Scripta Technica, Inc. Maurice Francon ; tr. from the French by Scripta Technica, Inc. Leonid Ivanovich Sedov ; tr. from the Russian by Scripta Technica, inc. J. Bass ; tr. by Scripta Technica, Inc. Arnold Kaufmann ; tr. from French by Scripta Technica.