Letter from T. North Whitehead to Whitehead
North asks his father to try to find a book on small hydraulic pumps, practical rather than theoretical if possible.
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Whitehead's Lost Papers
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Whitehead, T. North, "Letter from T. North Whitehead to Whitehead," LET1338, Whitehead Research Library, accessed March 30, 2023, http://wrl.whiteheadresearch.org/items/show/2563.