00458nam a22001577a 4500 4928 4928 200910b ||||| |||| 00| 0 eng d 620.1 W1772 763 Walker, J. D. Mechanical engineering science for National certificate, Vol - I 9th ed. London English Universities Press xi,195 p. 1951 7.60 Mechanical Engineering BK 0 0 ddc 0 620_100000000000000_W1772 0 13932 CL CL 1965-02-18 W. D. Willis 620.1 W1772 03009 2020-09-10 BK