country.map             A world map
country.regions         Names of all regions on the country.map
                        data.frame. A data.frame that includes both
                        English names and their iso2c equivalents.
county.map              Map of the counties of each of the 50 US states
                        plus the district of columbia.
county.regions          A data.frame consisting of the name of each
                        region in the map county.map as well as their
                        FIPS codes and state names.
state.map               Map of the 50 US states plus the district of
                        columbia.
state.regions           A data.frame consisting of each region on the
                        map state.map plus their postal code
                        abbreviations and FIPS codes.
