Mt Diablo Meridian


Here is a map of the Mt Diablo Meridian and Basline used in surveying that The Zodiac Killer place his button over the top which references geodetic mapping.

I have not checked any reference yet via the baseline.  Ill have to do an overlay.

https://en.wikipedia.org/wiki/List_of_principal_and_guide_meridians_and_base_lines_of_the_United_States

Mt Diablo, California, United States America, The Zodiac Killer

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