00478cam a22001097a 4500 180718b1970 xxu||||| |||| 00| 0 eng d I5517 Un3 Symposium on the application of operational research methods in solving the economic problems of planning and operating large electric power systems and on the use of computers by Economic Commission for Europe New York United Nations 1970 v.p. Economic Commission for Europe 491700 491700 0 0 0 0 IIPA IIPA 2018-08-04 I5517 Un3 G10729 2018-08-04 2018-08-04 G