"The Environs of London" Published by SDUK, 1832 This superior reproduction of the map of "The Environs of London" was originally published in 1832. This is a very fine example from the fascinating and highly accurate series of maps issued in London between about 1829 and 1850 by the Society for the Diffusion of Useful Knowledge, commonly known as the SDUK. The Society was formed in March 1828, by the publisher Charles Knight and Henry Brougham, a radical politician and reformer. During its lifetime, the SDUK was extremely active and published numerous informative works. Their publications were inexpensive texts, as their goal was to bring scientific and similarly high-minded material to the working and middle classes.