Cristobal, Ruel M. Performance of National Grid Corporation of the Philippines (NGCP) Laoag substation with interconnection of northwind : an assessment / Ruel M. Cristobal. - Laoag City : [s.n.], 2012. - xvi, 229 pages : illustration ; 28 centimeter. Bibliography: pages 113-114. Subjects--Topical Terms: Power transmission--Electric power distribution. Dewey Class. No.: TH 621.8 C86p 2012