London and Westminster improved : illustrated by plans. To which is prefixed, A discourse on publick magnificence; with observations on the state of arts and artists in this kingdom, ... concluded by some proposals relative to places not laid down in the plans. By John Gwynn. - Gwynn, John (printed for the author. Sold by Mr. Dodsley, and at Mr. Dalton's print-warehouse, Mr. Bathoe, Mr. Davies, and by Mr. Longman, 1766)