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Yellow Page Delivery Terms (Plus Tips!)

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Exchange A telephone call switching center serving a specific geographical area. Also referred to as NXX. Some scopings are by telephone exchange.
Right: Delivery points color-coded by telephone exchange (aka Central Office Prefix, COP, or NXX.)
Directory delivery maps by telephone exchange are available from DirectoryDistribution.com. Deliveries can also be mapped by any combination of  boundaries.
Fall-down Route A route in which the delivery carrier quit before completing.