(Pittsburgh, Association for Symbolic Logic, 1967). 8vo. Orig. printed wrappers. 22 pp.
(Pittsburgh, Association for Symbolic Logic, 1967). 8vo. In the original printed wrappers. In ""The Journal of Symbolic Logic"", Vol. 32, Nr. 1, March 1967. Very fine and clean. pp. 22. [Entire issue. 142, (2) pp.].
First edition.