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https://www.mfah.org/art/detail/29222ww.philamuseum.org/doc_downloads/education/object_resources/312173.pdfhttps://www.amphilsoc.org/sites/default/files/proceedings/490102ed.pdfhttp://www.silhouettesbyhand.com/news/2015/1/19/black-silhouette-artist-and-entrepreneur-in-early-america