I was hoping for perfect TXT files, but that didn't happen either at Google Books or at archive.org. Still the OCR's are pretty good - if I were going to post a song from Percy's Reliques in the Forum, I think I'd copy-paste the OCR text, and then use the image scan as a reference for correcting the OCR - more or less what I do now with other OCR scans.
I posted an OCR text from a CD booklet last night - I think it might have been quicker to type the whole thing, rather than correcting OCR errors.
-Joe-