This map is 1969 – ’68 & ’70 are different.
The section Zodiac mailed in is 8" x 6 3/4". It has it’s own unique code at the bottom: 9-QQ-1219-S.
The entire map is 18 3/4" x 34" – A thru H, 1 thru 18
This is the back side. The Phillips 66 symbol is in the top center. Interesting to note Lake Tahoeis on the back, as well as Lompoc.
Front side: 
Backside–Zodiac’s section in red
And thanks to "Nin" for (a long time ago) noticing and posting about the bleed-through of the "Phillips 66" symbol.
Again easily noticed here: http://zodiackiller.com/PMHR.html
Backside of the SF insert with the Phillips 66 symbol:
“…they may be dealing with one or more ersatz Zodiacs–other psychotics eager to get into the act, or perhaps even other murderers eager to lay their crimes at the real Zodiac’s doorstep.“ L.A. Times, 1969
