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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.

... to the friendly Reader ...?
A large decorative initial letter 'A' (mirrored) begins the first paragraph of the preface.
Friendly Reader? ...
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... T. C. concerns ...? The initials T.C. likely refer to the author or the title of the work being introduced.
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... friendly reader ...?
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... that oracle:?
This is a "signature mark," a guide for early modern bookbinders to ensure the pages were folded and bound in the correct sequence.