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The major change on the maps is the extent of railways portrayed, which varies enormously as the maps move from the 1830s to 1880s (? The date printed on the map refers to the underlying map and not to that of the railways, which were generally added in manuscript in red at some stage between the map printing and the sale of the copy; the dates on the maps and the extent of railways do not have a linear correlation, as some maps with earlier dates have more railways than maps with later dates.
Map codes are in very small numbers and letters and are located on the bottom line of each map.
For this discussion I am going to refer to the map code on the large state map on any given state map.
I think the best example of a map series using the Gousha map codes is the CONOCO Colorado map series.
The A–Z (pronounced "Ay to Zed"), or in full the Geographers' A–Z Street Atlas, is a name given to any one of a range of atlases of streets in the United Kingdom currently produced by Geographers' A–Z Map Company Limited.
Its first atlas, of London, was originally compiled in the 1930s by Phyllis Pearsall.
It has had at least 3 addresses: 1939 (or earlier) .