00333nam a2200109Ia 4500008004100000082001700041100001800058245004400076260003600120300002800156440003900184260902b        |||||||| |||| 00| 0 eng d  a512bD554.GT  aDicks, Warren  aGroups, trees and projective modulesb/  aBerlin:bSpringer-Verlag,c1980  avii, 126p. Index. Bibl.  aLecture notes in Mathematics ; 790