"watkins, a y. "
elecrical installation calculations: / a.y. watkins - 7 ed. - usa : elsevier 2006. - "ix, 150p.; 22 cm."
978 0 7506 6782 1
--
621. 3 wat
elecrical installation calculations: / a.y. watkins - 7 ed. - usa : elsevier 2006. - "ix, 150p.; 22 cm."
978 0 7506 6782 1
--
621. 3 wat