2004
USA
BAUPC Problems and Solutions
A competition for undergraduates in the Boston area, run from 1995 to 2004, known for short, tricky problems; many reappear in Morin's Introduction to Classical Mechanics.
2003
USA
2002
USA
2001
USA
2000
USA
1999
USA
1998
USA
1997
USA
1996
USA
1995
USA