TY - BOOK AU - Wright, John P. TI - The vital spark : an introduction to the generation , supply and the use of electricity SN - "0 435 68945 2" AV - TK146 .W75 PY - 1974/// CY - London PB - Heinemann Education Books KW - 1. Electrical engineering KW - "Y" N1 - "N" ER -