00370nam a2200145 4500 635 635 191108b ||||| |||| 00| 0 eng d 621.84 Y811 Youngson, Peter. 142 Slide Valves and Valve Gearing 4th Glasgow Munro 1927 240 p. Slide Valves ddc BK 0 0 ddc 0 621_840000000000000_Y811 0 2701 CL CL 1952-10-10 621.84 Y811 00058 2019-11-08 1 BK