Subsequent to his October 13th 1969 letter claiming the killing of Paul Stine, the Bus Bomb letter was the immediate communication in which he elaborated upon the details of this crime, and the first and only time he highlighted a specific section of text, demanding "must print in paper".. One has to ask, what prompted the Zodiac Killer to highlight these sixteen lines of text and insist they are not omitted from the newspaper? This is the section of text where he claimed officers Donald Fouke and Eric Zelms stopped and spoke to him, before he directed them away from the crime scene on a wild goose chase. The details of this interaction (whether the officers stopped him or not) was never publicized in the newspapers prior to the arrival of the Bus Bomb letter. This clearly irritated the Zodiac Killer enough for him to demand its publication.
This insistence of "must print in paper" was probably caused by the failure of the San Francisco Chronicle to publicize his threat on schoolchildren twenty-five days earlier. The Zodiac wrote in his October 13th 1969 letter "I am the murderer of the taxi driver over by Washington St + Maple St last night, to prove this here is a blood stained piece of his shirt. I am the same man who did in the people in the north bay area.The S.F. Police could have caught me last night if they had searched the park properly instead of holding road races with their motorcicles seeing who could make the most noise. The car drivers should have just parked their cars and sat there quietly waiting for me to come out of cover. School children make nice targets, I think I shall wipe out a school bus some morning. Just shoot out the front tire + then pick off the kiddies as they come bouncing out". Unfortunately for the Zodiac Killer, the San Francisco Chronicle omitted the final paragraph (highlighted in blue).
Although this cannot be proven, I doubt the Zodiac Killer phoned the Santa Rosa Police Department or the Press Democrat newspaper, and just stated "I am the Zodiac and I am going to blow up a school bus and kill kids in Santa Rosa", before hanging up. It is extremely likely this threat was inspired by the omission of text from the Chronicle, and he promised to kill schoolchildren in Santa Rosa and other locations in the Bay Area if the San Francisco Chronicle didn't include the omitted threats from his original letter on October 13th 1969. It is possible that Santa Rosa authorities contacted the police in San Francisco, who backpedaled their initial decision to avoid more widespread threats. Two days later, on October 17th 1969, the Chronicle newspaper published the threat on schoolchildren under the headline of Astrologer Joins Hunt for Killer. Their decision to omit Zodiac's text was reversed inside of forty-eight hours. This demand to print wouldn't be forgotten by the Zodiac Killer on November 9th 1969.
Three days after the Bus Bomb letter, on November 12th 1969, the San Francisco Chronicle under the banner of Zodiac's New Message printed the entirety of the "2 cops pulled a goof" section that Zodiac demanded they publish, which coincidentally fell on the same day as Officer Donald Fouke's interdepartmental memorandum of his encounter with a WMA on Jackson Street, shortly after the murder of Paul Stine. The Zodiac Killer's demand of "must print in paper" may have worked on both October 15th 1969 and November 9th 1969 - and why they are most likely the same person.
ASSOCIATED ARTICLE: PROOF:OCTOBER 15TH 1969 SANTA ROSA CALLER WAS THE ZODIAC KILLER