Most epub and Kindle on the IA are simply unproofed OCR of the scans. I gave up of those due to quality. I now only download definitely pd books in pdf format (after checking nowhere else has it) and usually have to process them to read on the eink due to scan quality especially coloured background. I'd usually crop and then after fixing background/text colour/contrast I'd convert to monochrome then 4bit 14 shades, black and white if it's a monochrome book (so far all are).
The Book of Knots had some bad errors in the 1944 edition, not just typos.
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