Newton's Clavis : new evidence on its dating and significance / by B.J.T. Dobbs.
Abstract:
"In 1975, as part of my study of Isaac Newton's early alchemy, I published a short manuscript entitled the 'Clavis' or 'Key'. The manuscript is unquestionably in Newton's handwriting ... Since 1975, however, a considerable quantity of new evidence has accumulated, some of which I should now like to present, for the 'Key' ... seems vital to a full understanding of the structure of Newton's alchemical work."
Ambix Vol. 29 (1982), p. 198-202