From AoPSWiki

...	to	1981 IMO Problems
1981 IMO Problems/Problem 1	to	1988 USAMO Problems/Problem 3
1988 USAMO Problems/Problem 4	to	1994 AJHSME Problems
1994 AJHSME Problems/Problem 1	to	1998 AHSME Problems/Problem 19
1998 AHSME Problems/Problem 2	to	2001 AIME I Problems/Problem 2
2001 AIME I Problems/Problem 3	to	2002 USAMO Problems
2002 USAMO Problems/Problem 1	to	2004 AMC 12B Problems/Problem 5
2004 AMC 12B Problems/Problem 6	to	2006 AIME A Problems/Problem 13
2006 AIME A Problems/Problem 14	to	2006 Cyprus MO/Lyceum/Problems
2006 Cyprus Seniors Provincial	to	2008 AIME II Problems/Problem 12
2008 AIME II Problems/Problem 13	to	2009 AMC 8 Problems/Problem 18
2009 AMC 8 Problems/Problem 19	to	2011 AMC 12A Problems/Problem 4
2011 AMC 12A Problems/Problem 5	to	Algebra/Intermediate
Algebra/Introduction	to	Coefficient
Cognos599	to	Euclidean geometry
Euclidean metric	to	Intermediate value property
International Math Olympiad	to	Mathematics winter programs
Mathew Crawford	to	Multiset
Murray Scholars	to	Quadratic Equations
Quadratic Formula	to	Time
Time dilation	to	Zorn's Lemma