00429nam a22001457a 4500 4096 4096 200716b ||||| |||| 00| 0 eng d 620.18 Y681 603 Young, G. B. Magnetic crack-detection; : notes on working principles and use of apparatus, London Charles Griffin & Co 1942 vi, 60 p. 1.13 Magnetic Testing BK 0 1 ddc 0 620_180000000000000_Y681 0 11890 CL CL 1952-10-30 Progressive 620.18 Y681 00732 2020-07-16 BK 0 1 ddc 0 620_180000000000000_Y681 0 11891 CL CL 1952-10-30 Progressive 620.18 Y681 00733 2020-07-16 BK