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Topographical and navigational survey of San Luis Obispo Bay and Port Harford.
The 1889 survey of San Luis Obispo Bay and Port Harford was based on surveys conducted as early as 1852. The map is focused on navigation of the bay listing the time and heights of the tides, latitude and longitude and location of bouys.
National Oceanic and Atmospheric Administration
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"1889 - San Luis Obispo Bay and Port Harford" (2018). Groundwater Basin Maps. 40.