The Key Map summarizes the overall layout of the city, showing the sequence and location of the zone maps. Map of the metro system and list of ... Show synopsis The Key Map summarizes the overall layout of the city, showing the sequence and location of the zone maps. Map of the metro system and list of stations. Up to 76 blank pages, giving you all the space you need to write, jot down useful information, and record your thoughts, stories, and memories. 32 removable sheets for loose notes and for exchanging messages. 12 translucent sticky sheets, to overlay and re-position, so that you can trace your route as you go. Up to 36 pages of zone maps, ranging in scale from 1:5,000 to 1:17,000 with large-scale maps of the city center, and an alphabetical street index. A personal, 96-page archive, with 12 tabs in two series of 6, so that everything that matters most is at your fingertips. The first 6 tabs are printed; the others are blank so you can personalize them with the enclosed adhesive labels.