
Pico Mansion State Historical Monument and the grounds of Whittier College highlight the developed landscape of eastern Los Angeles County during the late 1940s. This survey records a period of intense post-war expansion where agricultural land grants like Paso de Bartolo and Gertrudes (Colima) were increasingly occupied by burgeoning suburbs and industrial infrastructure. The region's heavy reliance on petroleum is evident in the dense network of oil refineries and sumps surrounding Santa Fe Springs and South Whittier.
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1894 · Los Angeles
USGS Topo · 1:62,500
1894 · Pomona
USGS Topo · 1:62,500
1896 · Pasadena
USGS Topo · 1:62,500
1896 · Anaheim
USGS Topo · 1:62,500
1896 · Downey
USGS Topo · 1:62,500
1897 · Pomona
USGS Topo · 1:62,500
1898 · Pomona
USGS Topo · 1:62,500
1898 · Anaheim
USGS Topo · 1:62,500
1899 · Downey
USGS Topo · 1:62,500
1900 · Pasadena
USGS Topo · 1:62,500