00294 a2200133 4500 0749260327 531.11 OPE 7974 11021 Block 4 dynamics Walton Open university 1990 1990 75p. 29cm DYNAMICS SR 36650 36650 0 0 0 0 SRC MAIN MAIN REF 2008-09-29 0 531.11OPE 3511 2017-09-01 00:00:00 0.00 2016-10-31 SR