Vol. 13 [Queries and HInts]
Two letters to James Dinwiddie from the Royal Institution
Two letters to James Dinwiddie from A Mercer
Trigonometry
One letter to James Dinwiddie from Lt. Gen. Helvill
One letter to James Dinwiddie from John McGeorge
One letter to James Dinwiddie from James White
One letter to James Dinwiddie from James Faulkner
Notes regarding celestial navigation
Mathematics, No. 1-3
Logarithms
Lecture Notes
Deduction of the Distance by Mitchell Method
Astronomy
A letter from Charles Elliot to James Dinwiddie
30 letter to James Dinwiddie from Joseph Hume