21.   The finding marked a milestone in the long-standing mystery surrounding the final resting place of the Polish count.

22.   The institute marks a milestone Thursday as it moves into its new administrative office and introduces the first three scientists it is bringing to Kansas City.

23.   The past weekend marked important milestones for both sides in the California debate.

24.   The run of the Dow also marked another milestone.

25.   The start of production will mark a milestone for a program that has endured a troubled evolution.

26.   They also mark a milestone for the historical society.

27.   This week marks another milestone for Eastland.

28.   This year marked a milestone for Corison.

29.   To mark the milestone, Graham will work as a flight attendant for U.S. Airways.

30.   To John Chou, Saturday marks a milestone in the history of his native Taiwan.