00430pamaa2200157 4500 0000013882 20060706090000.0 0748715940 (pbk) 540 RAM QD33 RAM 1993 RAMSDEN Calculations for A-Level chemistry E.N. Ramsden. 3rd ed. London: Stanley Thornes, 1993. viii, 298p.: 25cm. Chemistry -- Problems, exercises, etc