A second letter to the author of An examination of the principles and conduct of the two b-rs: in which the many misrepresentations and groundless conjectures, contained in his second series of facts and arguments, &c. are detected and exposed. 
Author of the First Letter.
London : printed for J. Millan; and G. Keith,
[1749]
Reproduction of original from the Harvard University Houghton Library.
The author of 'An examination of the principles' = John Perceval.
The two b-rs, i.e. two brothers = T. Pelham Holles, Duke of Newcastle and Henry Pelham.
ESTC