Combinatorial functors [by] J. N. Crossley and Anil Nerode. Crossley, John N. Nerode, Anil, 1932- joint author. Functor theory. Combinatorial analysis. QA169 .C7 512.5 CRC Bibliography: p. [139]-140. Berlin, New York : Springer-Verlag, c1974. c1974. 1974 Text viii, 146 p. eng Ergebnisse der Mathematik und ihrer Grenzgebiete, Bd. 81