http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
A puzzle book of moral maxims printed on facing pages printed in black and red. "Anyone ... may easily point out, and truly find which of these lines you did commit to mind; provided you declare on which red side that individual line may be descried."
A similar work, published under title "The impenetrable secret," is attributed to Horace Walpole in the British Museum Catalogue.
The American Antiquarian Society copy bears an owner's inscription dated 1799. The only Joseph Gales of 18th-century typographic record (1761-1841) printed at Philadelphia between 1795 and 1799.
Electronic text and image data. [Chester, Vt. : Readex, a division of Newsbank, Inc., 2002-2004. Includes files in TIFF, GIF and PDF formats with inclusion of keyword searchable text. (Early American imprints. First series ; no. 49582).