While many of the lodgings, brothels and bars are detailed on pages 31-35, not all locations are given full write ups. Table CR-3-4 found right after the Overpass map on pages 48 and 49 have all the listed map key locations with some basic info about their purpose, civilians, soldiers, power and weapons. Overpass is so huge it practically needs its own sourcebook in my opinion. The omission of the key on the Overpass map on pages 410-413 is probably just an oversight. Hope this helps and sorry for the late response.