About
Open Folio Archive is a catalogue of digitised editions of printed works that are in the public domain.
How volumes are prepared
- Every leaf is scanned in order, including covers, fold-outs and blank pages.
- Master TIFF files are kept unaltered apart from cropping to the page edge.
- PDF editions are generated from the masters, in full and reduced resolution.
- Checksums are produced for every published file.
Scope
The archive concentrates on illustrated works — natural history, anatomy, early science and mathematics — where image quality matters most.