
Santa Gertrudis and Los Cerritos ranchos dominate the landscape of the southern Los Angeles basin at the turn of the century, long before the region’s suburban transformation. The survey reveals a coastal plain defined by a dense web of steam railroads, including several specialized branches like the Southern Pacific R. R. Whittier Branch and the San Pedro Branch. Agricultural and early industrial hubs such as Downey, Whittier, and Santa Fe Springs are clearly established near water sources like the Rio Honda and San Gabriel River.
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