What could be the historical context behind this?
Could some of the entries just be misdated by 100 years? I feel like there's no context in the world where this would make sense
There's context here. I have an edition of the Bible that mentions Thomas Jefferson in the preface. Could be the Google index is going off original publication date, not updated edition date.
I think that makes sense - all the anachronistic mentions appear to be placed from 1820-1840 which is just about when the term started taking off. Might be due to a printing error or even some wonky font stuff leading to the date being recorded a century earlier.
The prophecy foretold Lenin's birth and his intellectual contributions!
It's definitely some kind of more recent edition of a book that the editors put in a reference, footnote, or preface that mentions Marxism-Leninism. It might be a book by one of those pre-Marx utopian socialists, like Robert Owens
I would guess that it's Google's robot that reads books and logs the info misreading a year.
It's just Google Book's OCR messing up reading publish dates as 182X instead of 192X.
Spelling probably, a lot of old work has strange letters and spelling.
