Bordered by ranchos El Cajon de San Juan, Cajon de Santa Ana, Bolsas, San Joaquin, and the Pacific Ocean. Original survey: 1857 Nov & Dec.; copy confirmed by J. W. Mandeville to Bernardo Yorba et al.. Inset with table of boundary data. Color highlights, detailed hachures, structures, water bodies including Santa Ana River, structures, rugged mountains.
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