2 offprints from Adolf Grunbaum collection, one inscribed: Theories and Explanations in Biology (1969); Approaches to Reduction (1967)
Cambridge: Harvard, 1967-1969. Wraps. 2 offprints from the collection of philosopher Adolf Grunbaum. "Theories and Explanations in Biology" inscribed "with best regards, Ken." The other one has "A. G." written in red ink on cover.