00000camaa22000001a 4500 UP-1685675941123695558 Buklod 20071009080232.0 a r |||| u| ta 730109s1954 ilu r |000 0|eng d DLC DLC DLC HV 45 T47 1954 Thelen, Herbert Arnold 1913- Dynamics of groups at work. Chicago University of Chicago Press [1970 c1954] 379 p. Social group work. FO UPTAC UPTAC HV 45 T47 1954 Book