Names and Location of Selected U.S. Cities

DATA DESCRIPTION:
name:     character vector of city names.
state:    character vector giving state for each city.
x,y:   location of city: x is negative longitude to correspond to
       coordinate  system  set up by function usa.  y is latitude
       (both measured in degrees).

       These cities cover the geographical regions of  the  U.S.,
       and were not chosen by population.