Trinidad, Lyn Mour Ramirez Status of the salt industry in Ilocos Sur / Lyn Mour Ramirez-Trinidad. - Vigan City : [s.n.], 2011. - xiv, 132 pages : illustration ; 28 centimeter. Bibliography: pages 93-94. Subjects--Topical Terms: Industries. Dewey Class. No.: TH 338 T73s 2011