1992, Boulder, Colorado
1989, Boulder, Colorado
1988, Boulder, Colorado
1978, Boulder, Colorado
1977, Boulder, Colorado
1973, Boulder, Colorado
1970, Boulder, Colorado
1967, Boulder, Colorado
1966, Boulder, Colorado
1963, Boulder, Colorado
1961, Boulder, Colorado
1960, Boulder, Colorado
1939, Boulder, Colorado
1938, Boulder, Colorado
1936, Boulder, Colorado
1933, Boulder, Colorado
1929, Boulder, Colorado
1921, Boulder, Colorado
1910, Boulder, Colorado
