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I think it's free if you subscribe or something of that sort
The books are not scanned, they are photographed.
FWIW, Scanning old lettering manuals is often not an option unless you have a big budget. They’re usually too big to fit an standard letter/A4 scanner. And some were printed on horrible paper with horrible bindings that just crumbles if you try to scan it with a flatbad scanner. I gave up on scanning an early edition of Atkinson because every time I put it on the scanner bits of paper fell out so I couldn’t get a good image. Doing better than what Jason is doing would require going into a photo studio and using a large format document scanner with an SLR camera.