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(British, Badger Books SF-69, 1962)
(Australia, Pitt Bond PB512, 1966)
(USA, MacFadden-Bartell 60-447, 1970) Author changed to Mel Jay
(USA, Modern Productions [Unibook], ?)Author changed to Mel Jay. Published after MacFadden-Bartell version. You can see the yellow title letters of the MacFadden-Bartell full-cover painting peeking out under the white mask on the right hand side.
(USA, Arcadia House, 1966)
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