Watkins , A. J. Electrical installation calculations [[Book] /] A.J. watkins ,R.K.Parton. - 5th. ed. - London : Edward Arnold, 1992. - 112 p. ; : ill ; 20cm. - 1 . All age. ISBN: 0340568666 Subjects--Topical Terms: electrical. Dewey Class. No.: 621.30151 National Library of Medicine Call No.: 621.30151