A supplementary note on the mould board described in a letter to Sir John Sinclair, of March 23, 1798, inserted in the American Philosophical transactions, vol. 4 nd in Maese's Domestic Encyclopedia voce Plough [Thirty-seven lines and diagram] T
Imprint 2.; Evans 33934.
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Printed Ephemera Collection; Portfolio 149, Folder 13a.
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