a factor with levels
Albuquerque
, Alexandria, Va
, Anchorage
, Asheville,
NC
, Atlanta
, Baltimore
, Baton Rouge
, Billings, Mt
,
Birmingham, Al
, Boise, Id
, Boston
, Buffalo
,
Burlington, Vt
, Cedar Rapids
, Charleston, WVA
,
Cheyenne, Wy
, Chicago
, Cincinnati
, Cleveland
,
Columbia, SC
, Concord, NH
, Denver
, Des Moines
,
Detroit
, East St. Louis
, Fargo, ND
, Fort Smith, Ark
,
Fort Worth
, Grand Rapids, Mi
, Greensboro, NC
,
Honolulu
, Houston
, Indianapolis
, Jackson, Miss
,
Kansas City
, Knoxville, Tn
, Las Vegas
, Lexington,
Ky
, Little Rock
, Los Angeles
, Louisville
, Memphis
,
Miami
, Milwaukee
, Minneapolis
, Mobile, Ala
,
Montgomery, Ala
, Muskogee, Ok
, Nashville
, New Haven,
Conn
, New Orleans
, New York (Brooklyn)
, New York
(Manhattan)
, Newark, NJ
, Oklahoma City
, Omaha
,
Oxford, Miss
, Pensacola, Fl
, Philadelphia
, Phoenix
,
Pittsburgh
, Portland, Maine
, Portland, Ore
,
Providence, RI
, Raleigh, NC
, Roanoke, Va
,
Sacramento
, Salt Lake City
, San Antonio
, San Diego
,
San Francisco
, Savannah, Ga
, Scranton, Pa
, Seattle
,
Shreveport, La
, Sioux Falls, SD
, South Bend, Ind
,
Spokane, Wash
,Springfield, Ill
, St. Louis
,
Syracuse, NY
, Tampa
, Topeka, Kan
, Tulsa
,
Tyler, Tex
, Washington
, Wheeling, WVa
, and Wilmington,
Del