This historical map portrays the area of Isabela in 1960, primarily covering Isabela County as well as portions of Aguadilla County. Featuring a scale of 1:20000, this map provides a highly detailed snapshot of the terrain, roads, buildings, counties, and historical landmarks in the Isabela region at the time. Published in 1971, it is one of 4 known editions of this map due to revisions or reprints.