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If you spot an error, have a suggestion, or just want to say hello — we’d love to hear from you.

A perforated stamp near the center of the page, consisting of small holes forming a circular or lettered pattern, likely a Library of Congress ownership mark.
copyright The legal right granted to an author or publisher to exclusive publication and sale of a work.
D. Appleton and Company A well-known American publishing firm founded in the 19th century that specialized in scientific, medical, and high-quality literary works.