This series contains correspondence pertaining to the building and purchasing of Alvan Clark & Sons telescopes and lenses. There are price quotes, invoices, and receipts. There is correspondence from well-known astronomers including discussions of new astronomical objects observed with telescopes. Additionally, there are business records that include licenses, articles, and honorary degrees. The series begins with incoming correspondence, arranged alphabetically by author, followed by outgoing correspondence. The remaining materials are arranged alphabetically.
