Some other pages (not included in the my photographs) have US locations. (But I like the detective work!)
I hadn’t though to try a reverse image search on that logo(?); too bad it didn’t turn up anything!
I also noticed (after posting) that in my last photo, the pages are numbered right to left, whereas the others are left to right. I wonder if that was a second textbook.
I do know we learned katakana fairly early on, and then we learned hiragana after that. Must have been taught those separately from the textbook. (Clearly Hasegawa-sensei was something of a rebel.)
It’s probably not that bad for its time. (But maybe I’m being too generous.) You have to have a few things in your talent stack to write an English high school text book that teaches Japanese pre-Internet, after all.
I just hope schools are using better books now. Even books like Genki have their flaws and are showing their age.