William J. Canby is best known for promoting the memory of his grandmother, Betsy Ross, flag maker, in particular in presenting a paper to the Historical Society of Pennsylvania in 1870 on Betsy Ross.
References
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Book Notes: Consisting of Literary Gossip, Criticisms of Books and Local Historical Matters Connected with Rhode Island, Volume 28 S. S. Rider., 1911 pages 100 and 117 mention George and William J. Canby, grandsons of Betsy Ross
