The alphabetical index of place-names 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 entry for Rabbah (Amman) on the first map is listed as 1:C5—that is, map 1, square C5. Specific locations on a particular map can be located by referring to the coordinates on the top and side of that map. Alternative names of places are listed in parentheses—for example, Rabbah was also known as Amman. A question mark following a name indicates that the location shown on the map is possible or probable but not yet certain.