Have you been in touch with the Papers of Henry Laurens people?
Their publication of the Laurens Papers has not yet reached the "Tower"
period, but you might find what you need in documents in their files.
Try either: C. James Taylor at: taylorj@hsscls.hssc.scarolina.edu
or David Chestnutt at: david.chesnutt@scarolina.edu
Best wishes
Mary Gallagher
The Papers of Robert Morris
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