Forest Blight - Yes, that is what I am seeing. I think the similarities from the artwork to the monument are too close to be a coincidence. The shoulder and arm outline is not the same on either side, but I think the fact that they are not uniform, like the monument, is what is important here. It does appear that the left arm/shoulder matches better on the left side of the monument than right.
As far as the timing goes, I researched this during my discovery phase a few months back. This is the general story about how the monument got there:
"How do I get to Angel Island? What will I see there?
Our section Island Information has information on how to visit Angel Island Immigration Station as well as other information about the Island (ferries, campsites, tours, etc). To visit the Station, visitors will need to take a ferry from either Tiburon, San Francisco, or Oakland/Alameda to Angel Island, and then walk about a mile to the station. The Immigration Station site has a few remaining buildings: a power plant, hospital, pump house, mule barn, and barracks (which contain the poetry). The barracks houses a museum and is the only building open to the public by guided tour. A mess hall and two other barracks remain from when the site was used as a World War II prisoner of war processing center. The site also has restrooms, a drinking fountain, a historic fog warning bell once on the wharf's pier, and a monument donated in 1979 by Victor Bergeron, owner of Trader Vic's restaurant in San Francisco."
This is from: http://www.aiisf.org/faqs
So the date fits and since it was somewhat new at the time of the writing of the book and was probably a "good fit" and/or too hard to ignore for the author. I understand that he had a freind or relative in the area and probably tipped him off of this.
As far as Coit Tower goes, It is an important part of this puzzle, but I don't beleive that it is the area of interest. I will explain later..








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