00447nam a22001457a 4500 230621b |||||||| |||| 00| 0 eng d National Science Library National Science Library 625.1(540) P7 50 Years of technical excellence 1957-2007 Research Designs and Standards Organisation, 2007 74p. Railway technical bulletin Bulletin udc REF 45733 45733 0 0 udc 0 6251540_P7 0 69349 NSL NSL GF/Rk-13/C-14/R-3 2007-04-27 0 625.1(540) P7 227015 2023-06-21 00:00:00 2007-04-27 REF