Book excerpt: Mapped out in 1746, Rocque's survey of London was the most detailed of its time, and is charmingly and attractively illustrated. Produced over two sheets, it also offers enough detail for local historians and genealogists and is a fascinating portrait of Britain's capital at the beginning of the Industrial Age. The map is folded within a sleeve in a keepsake portfolio package which features an authentic period cover and an explanation of the map's historical significance.