I knew gamebooks dated back much further than Choose Your Own Adventure and Steve Jackson's Melee and Wizard solo games. I used to play educational logic "gamebooks" back in the early 1960s. But it turns out that "Alan George"'s Treasure Hunt not only anticipated all that by a further two decades (it was published in 1940) but also sort of pioneered the graphic novel gamebook genre that I thought Russ Nicholson and I had invented in the early '80s.
Prior to that was Consider the Consequences, a gamebook of life choices, love, marriage and careers by Doris Webster and Mary Alden Hopkins, which came out in 1930.
Much more up to date is a new(ish) open-world gamebook called Traquelero: A Quest for Happiness, by Othniel Poole. It seems pretty hard to get hold of, which is a shame as the concept sounds fascinating. No dice, no stats, just a character journey to explore. Effectively a walking sim in gamebook form? I'd like to try it and find out.