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Some maps include a simple alphanumeric grid to aid in locating places. To locate the city of Adams, Massachusetts, for example, Adams would be looked up in the place-name index for the map of Massachusetts. Opposite the city's name is the symbol B 2, signifying that Adams can be located on the map where the row down from “B” overlaps the row right from “2.”
© Encyclopædia Britannica, Inc.
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