NW Luzon - Allied Forces. Southwest Pacific Area. ([S.l. s.n.], 1944)
no. 97 Terrain study. 15 Nov. 1944. -- no.97A. Engineer annex ; Vigan and vicinity, N.W. Luzon, P.I. (Salomangue Harbor to Abra River). 5 Jan 1945.
Keywords: Military geography -- Philippines -- Luzon, Northwestern