New York: Seth Siegelaub, 1968. First edition. Square 8vo,  pp, offset printed. Saddle-stapled wraps. Illustrated with black and white photographs.
"The existence of each each sculpture is documented by its documentation." - from the introduction.
Artists' book which takes the form of an exhibition catalog, documenting, in deadpan fashion, works which take place in the catalog. The catalog is the exhibition. Of special note is project no. 11, which maps a mail art project of postal receipts across the 42nd parallel in the U.S.
A couple light creases to tips, else a fine example. Item #28287