2011, Dallas, Texas
1991, Detroit, Michigan
1989, Boston, Massachusetts
1985, Boston, Massachusetts
1977, Dallas, Texas
1974, Fort Worth, Texas
1972, Corpus Christi, Texas
1970, Dallas, Texas
1969, Providence, Rhode Island
1968, Richmond, Virginia
1966, Washington, District of Columbia
1964, Dallas, Texas
1961, Fort Worth, Texas
1961, Lincoln, Nebraska
1960, New Harmony, Indiana
1954, New York, New York
1953, New York, New York
1952, , Minnesota
1949, New Canaan, Connecticut
1941, Cambridge, Massachusetts
