The American traveller : containing observations on the present state, culture and commerce of the British colonies in America, and the further improvements of which they are capable; with an account of the exports, imports and returns of each colony respectively,--and of the numbers of British ships and seamen, merchants, traders and manufacturers employed by all collectively: together with the amount of the revenue arising to Great-Britain therefrom. : In a series of letters, written originally to the Right Honourable the Earl of ******** /