Il Popolo Della Cometa (cover)
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Editions/Publications:
- Unknown. Seventy-Five: The Diamond Anniversary of a Science Fiction Pioneer (Unknown, Allison, Haffner Press, ISBN-10: 1893887200, $50.00, 599 pages, Hardcover, Collection)
- Unknown. Seventy-Five: The Diamond Anniversary of a Science Fiction Pioneer (Unknown, Allison, Haffner Press, ISBN-10: 1893887219, $175.00, 599 pages, Hardcover, Collection)