The maps in this edition are presented in a card folder, each with its own envelope to protect it, connected by a spine. When you open the folder, the interior surfaces contain an introduction to Booth's maps, giving brief details of what London was like, what motivated Booth to create the maps and how they were used. It also expands on the keys shown on each map.
When you lie east and west side by side it is daunting to see how polarized they were in terms of poverty, with the east showing great areas at the blue (impoverished) end of the scale, whilst the yellow (the top end) are confined to the west (albeit with some blue patches crowded into nooks and crannies)
The maps are reproduced on good quality slightly shiny paper, with all-importantly good quality colour reproduction so that it is easy to make out which colours are which (Booth used incremental shades of blue and red, which could have been very difficult to distinguish from each other in an inferior quality edition). Road names are easy to pick out and a grid sits over the top (the space between the horizontal lines representing half a mile). This is a really excellent pair of maps and essential to anyone interested in late 1900s London.
Thanks very much to the anonymous person who posted a comment and reminded me that there is an online project run by the London School of Economics called "PhoneBooth" that enables you to view different parts of Booth's maps with a series of overlays of London, using the + and - signs to zoom in on areas of interest. The application is in Beta testing at the moment, and is a bit clunky to use, but it is an excellent idea and with patience works really well. http://phone.booth.lse.ac.uk/