
Rio Grande de Loiza snakes through the eastern landscape of this coastal survey, defining the boundaries and agricultural patterns of the early 1960s. The northern coast is characterized by a dense network of mangroves and wetlands, protected within the Bosque Estatal de Piñones and surrounding the Laguna de Piñones. This era shows a significant intersection of traditional settlements and emerging urban infrastructure, with the Hipodromo El Comandante and the Aeropuerto Internacional de Isla Verde standing as major regional landmarks. Inland, the transition from the concentrated residential blocks of Carolina and Villa Carolina to the more rural, plantation-influenced barrios of Hoyo Mulas and Torrecilla Alta is clearly visible. The presence of numerous small schools like Escuela Amalia Expósito and local industrial features like the Cantera quarry sites highlight the community-scale development typical of the period.
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1940 · Carolina
USGS Topo · 1:30,000
1941 · San Juan
USGS Topo · 1:30,000
1941 · Rio Grande
USGS Topo · 1:30,000
1941 · Carolina
USGS Topo · 1:30,000
1945 · El Yunque
USGS Topo · 1:30,000
1946 · El Yunque
USGS Topo · 1:30,000
1946 · Aguas Buenas
USGS Topo · 1:30,000
1946 · Gurabo
USGS Topo · 1:30,000
1947 · Carolina
USGS Topo · 1:30,000
1947 · Gurabo NE
USGS Topo · 1:10,000