XVII Machines.

Pittsburgh & Derry: Sisyphus Editions, 1976. First edition. [28 pp]. Near fine in stapled wrappers. One of 400 numbered copies. INSCRIBED by Heyen on the front free endpaper, “Len, this is one of five / sequences that will be in / a book in the spring. I / still don’t know if I / like these things! / Bill / Oct./1980.”