List of Ace double titles
http://dbpedia.org/resource/List_of_Ace_double_titles
American company Ace Books began publishing genre fiction starting in 1952. Initially these were mostly in tête-bêche format with the ends of the two parts meeting in the middle and with a divider between them which functioned as the rear cover of both (the two parts were oriented upside-down with respect to each other in order to effect this), but the company also published some single volumes during the early years. The proportion of singles increased until they stopped producing doubles about 1978. The tête-bêche format was discarded in 1973, but future double novels were continued for a while with both parts oriented the same way, so that the first page of one part followed soon after the last page of the other part.
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List of Ace double titles
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American company Ace Books began publishing genre fiction starting in 1952. Initially these were mostly in tête-bêche format with the ends of the two parts meeting in the middle and with a divider between them which functioned as the rear cover of both (the two parts were oriented upside-down with respect to each other in order to effect this), but the company also published some single volumes during the early years. The proportion of singles increased until they stopped producing doubles about 1978. The tête-bêche format was discarded in 1973, but future double novels were continued for a while with both parts oriented the same way, so that the first page of one part followed soon after the last page of the other part. Between 1952 and 1968, the books had a letter-series identifier; after that date they were given five-digit numeric serial numbers. The list given here includes every Ace Double Book published between 1952 and 1978, for all genres. It gives a date of publication; in all cases this refers to the date of publication by Ace, and not the date of original publication of the novels. For more information about the history of these titles, see the entry for Ace Books, which includes a discussion of the serial numbering conventions used and an explanation of the letter-code system.
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