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It's not what you asked for, but here is a letter dated December 29, 1788, to Calvin Spencer from Jacob William Harvey, which was reprinted in The South Carolina Historical and Genealogical Magazine at page 96. There are some references to the Revolution.
https://www.carolana.com/SC/eBooks/SCHGM/The_South_Carolina_Historical_and_Genealogical_Magazine_Volume_XVIII.pdf
See also, https://founders.archives.gov/documents/Washington/05-08-02-0127
Also:
Here is a link to ancestry.com profile for him with a number of sources:
https://www.ancestry.com/family-tree/person/tree/13479519/person/252306137226/facts?_phsrc=daq1188&_phstart=successSource
I think that you use ancestry.com.