The maps index can help you locate a particular place on the maps. Each entry includes the map number followed by the grid reference composed of a letter-number combination. For example, the location of Fort Hall is given as 6:B1—that is, map 6, square B1. You can locate specific squares on each map by referring to the coordinates on the top and side of that map. Alternate names of places are listed in parentheses; for example, Council Bluffs (Kanesville).