"William Bradford / American printer (1663-1752)". Britannica online. Encyclopedia Britannica. 2021. Retrieved September 25, 2021. ..., he established the first paper mill in America, at Roxborough....
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Reese, William S. (1978). "Works of George Keith Printed in America: A Chronological Bibliography". The Princeton University Library Chronicle. 39 (2): 98–124. doi:10.2307/26402182. JSTOR26402182.
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Johns 1992, p. 24. Johns, David L. (1992). Convincement and disillusionment: printer William Bradford and the Keithian controversy in colonial Philadelphia. Kent State University. OCLC27416154.
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