Book 91.
Publisher: Space Heater Multiples
Place of publication: Barrytown, N.Y
Number of pages: 24
Subjects: Smith, Keith A., -- 1938-; Artists' books -- United States.
Other titles: Book ninety-one.
Notes: Limited ed. of 50 copies numbered and signed by the artist.

An art work, without printing except for the embossed t.p. Termed a "string book" in the artist's Structure of the visual book, 1984, p. 95. Its leaves are strung together with linen cords and punched with holes to create varying effects of light and shadow when viewed with a single light source.