This is the Zodiac speaking.
I have become very upset with the people of San Fran Bay Area. They have not complied with my wishes for them to wear some nice (symbol) buttons. I promised to punish them if they did not comply, by anilating a full School Buss. But now school is out for the summer, so I punished them in another way. I shot a man sitting in a parked car with a .38.
(Symbol) -12 SFPD - 0
The Map coupled with this code will tell you where the bomb is set. You have untill next Fall to dig it up.