List of Ace SF double titles
http://dbpedia.org/resource/List_of_Ace_SF_double_titles
Ace Books published 221 science fiction Ace doubles between 1952 and 1973 in tête-bêche format, and a further 40 between 1974 and 1978 in a more traditional format in which the two books are both the same way up.
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List of Ace SF double titles
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4971169
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1090709428
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Ace Books published 221 science fiction Ace doubles between 1952 and 1973 in tête-bêche format, and a further 40 between 1974 and 1978 in a more traditional format in which the two books are both the same way up.
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35821