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This library is built in the open.
If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

A small rectangular paper patch, likely a repair or a hinge from the binding process, is visible on the center-left margin.
Frankfurt and Leipzig? These two cities served as the twin capitals of the German publishing world, where major book fairs were held and most significant works of the period were printed.