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There is a page named "File:Charles Koch's Signature.png" on Wikipedia
DescriptionCharles Koch's Signature.png English: Charles Koch's Signature Date 1 January 2021 Source https://news.kochind.com/news/2020/how-koch-is-fighting-covid-19...(286 × 53 (5 KB)) - 15:27, 22 February 2024
DescriptionPortrait of Nathan Cooley Keep.png English: Portrait of Nathan Cooley Keep with the signature. From Koch, Charles R. E. (1909). History of dental surgery...(1,354 × 2,182 (4.36 MB)) - 18:49, 6 June 2024
