Secaucus, NJ: University Books, 1976. First American edition, following the Italian edition of 1971. Translated by Lovett F. Edwards. 379pp., heavily illustrated in black-and-white. 8vo. Blue textured-paper boards; silver spine titles; dust jacket. Light bump to top rear corner. 1/4-in. split to paper at head of spine. Remainder mark to base of textbook. Unclipped ("$10.00") jacket with chipping to spine ends, light rubbing. Very good in a very good (-) jacket. An argument that extraterrestrial visitors in prehistory were responsible for shaping human evolution.