Zodiac Killer - Lt Col Norman Edwin Denning copper bolt datum
Here is the copper bolt for initial point cadastral boundary centralised reference which is more than likely where the piece of map ripped out by The Zodiac Killer was survey referenced from. Lt Col Norman Edwin Denning was responsible for the Mt Diablo (Devil Mountain) initial point meridian and baseline. Zodiacs spatial map, Phillips 66 petroleum map would have been created from this initial benchmark point. *Note the symbol of circle and cross aka crux of the initial point in reference Zodiacs ciphers and map denoting set to magnetic north (16.5 to 17 degrees magnetic declination). So, S = (R(map inches) * θ ); Zodiac has symbols through his encryption code
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