Between 1824 and 1828 William Ebden produced a set of county maps which were issued under various publisher's imprints, and probaby only sold singly. In 1833 they were re-published by James Duncan in a thematic atlas to illustrate the representative changes brought about by the 1832 Reform Act. There were several subsequent editions between 1835 and 1845, with railways being added to the later editions. This example has no railways (first added 1840) and is therefore from one of the earlier editions of Duncan's atlas between 1833 and 1838. The printing plates were later acquired and re-used by Stanfords.