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- M: Amazing, July 1959
- HB: Avalon, 1961, 224 pages
- PB: Ace (Double F-123 with
Leigh Brackett's The Nemesis from Terra),
1961
- PB: Ace, 1976, 180 pages
- PB: Ace, 1982, 180 pages, ISBN
0-441-11511-X
- PB: Tor 1988, 180 pages, ISBN
0-812-55473-6
From the cover blurb
(1976):
After four centuries
of space travel, mankind seemed to be supreme in the
universe--until the discovery of an advanced alien
empire threatened to destroy everything that man had
achieved. And unless someone, or something,
produced a miracle there was nothing to prevent the
inevitable collision of two civilizations and the
destruction of their worlds...
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