The two stories have been published with full titles:
Extracts from Adam's Diary: Translated from the Original Ms.
Eve's Diary: Translated from the Original Ms.
--variously fashioned "MS", "Ms", "MS.", "Ms."
Reissue of the 1904 and 1906 bound together, with original illustrations and pagination
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Publ date inferred from notices Chi. Tribune 1931-07-25 p11 "a new edition of this work, which up to this time has been published as two separate books"; from listing NY Herald Tribune -07-26 pK13 "Books of the Week", as Reprint; and from the next item
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Price from brief review Hartford Courant -08-02 pE6
(reviewed during the following week in Chi. Tribune and NY Times)
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HathiTrust Digital Library provides full view of one copy with original cover (and one apparently identical, mis-catalogued as 1906)
-- cover illustration is that on frontispiece of the 1906 chapbook Eve's Diary, illus. by Ralph
-- second printed page reproduces a recently discovered note from Twain, in his own handwriting, which requests "let's bind Adam & Eve in one cover", with explanation
-- frontispiece is that of the 1904 chapbook Extracts from Adam's Diary, illus. by Strothmann
-- copyright dates 1893, 1901, 1904, 1905, 1906; states First Edition
-- text spans p[1]-89, p[1]-[109]
Throughout the book each even-number page (unnumbered in the second series) shows one illustration; each odd-number page shows corresponding text.