1968, Dallas, Texas
1968, Nashville, Tennessee
1966, Atlanta, Georgia
1966, Grand Rapids, Michigan
1966, Chicago, Illinois
1966, Washington, District of Columbia
1965, Waimea, Hawaii
1965, Roanoke, Virginia
1965, Des Moines, Iowa
1964, Richmond, Virginia
1964, Lincoln City, Oregon
1963, Houston, Texas
1963, Air Force Academy, Colorado
1961, Grinnell, Iowa
1960, Fort Worth, Texas
1960, New Haven, Connecticut
1960, New Orleans, Louisiana
1959, Grinnell, Iowa
1958, Sterling, Virginia
1958, Air Force Academy, Colorado
