Here's the skinny: OCR, proofread the entire thing in FineReader, track down the fonts (or fonts that look similar), vectorize the graphics and/or process the photos that can't be vectorized, spend a heck of lot of time redoing the layout in Word or InDesign, export as PDF and then proofread the final product.
The quality will be very good, and it's always a pleasure to read such a book. But not many people are willing to put in the effort.
You will find many more posts on this forum about this. Search the forums, google. Some training videos on using Word, InDesign, Illustrator, Acrobat, etc wouldn't hurt either. As open-source alternatives there's LibreOffice, Scribus, Inkscape, etc. They're also very good and will do the job nicely, and Youtube is full of tutorials on using them. But in the end it still comes down to you, because you're the one that has to put in the hours, learning as you go along.
Such a book can even take up a month or two, depending on the level of interest you have in the material. So make sure it's worth it, and that it's not already available as an e-book.
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