Lewis, Henry Trickey, 1928-, Socioeconomic variability in two Ilocano barrios of northern Luzon, Philippines [microform] / by Henry Trickey Lewis. - Ann Arbor, Mich. : University Microfilms International, 1968. - 1 microfilm reel : positive ; 35 mm. Thesis (Ph.D.) - University of California, 1967 Subjects--Geographic Terms: Philippines--Social conditions.