L'enigma di Aton Ay dal Signore delle terre al Signore dei Cieli.

Orbit 1994, cm.11x18, pp.442, brossura copertina figurata a colori. A sequel to "Crisis on Doona". 25 years after the original human settlers arrived, only to find Doona already inhabited by the cat-like Hrrubans, the treaty which established their cohabitation is due for renewal. But a crisis has marred the celebrations, sparked by political and personal greed.

Con la colaborazione di F.Boggio Merlo. Bologna, Zanichelli Ed. 1986, cm.17,5x25, pp.270, legatura ed.in tutta tela,sopracop.

Londra, Harper & Brothers Publishers 1900, cm.12x17, pp.286, legatura ed. Coll.Makers of History.

Foreword by R.Sturgis Ingersoll. Introductions by Henry G.Gardiner, Kneeland McNulty and Jean Gordon Lee. Philadelphia, Philadelphia Museum of Art 1964, cm.19x26, pp.210, 244.ill. e tavv.nt, di cui 4 a col., brossura, copertina figurata a colori. Prima edizione.