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
Document Item Type Metadata
Whitehead, T. North, "Letter from T. North Whitehead to Whitehead," LET1338, Whitehead Research Library, accessed December 8, 2022, http://wrl.whiteheadresearch.org/items/show/2563.