Because of a production error, information about a Kennedy Center play on singer Marian Anderson was left off the Weekend's Best page in some editions of today's Weekend section. Here is the information: The Kennedy Center's production of "My Lord, What a Morning: The Marian Anderson Story," a look into the life of one of the more potent voices in American musical and social history, opens Friday and runs through March 28 in the center's Theater Lab. Performances, intended for ages 9 and up, are Fridays at 7, Saturdays at 1 and 3, and Sundays at 1. Tickets are $10. Call 202/467-4600 (TDD: 202/416-8524).

Associated Press reporter Ron Fournier's name was misspelled in yesterday's Politics column.

An article yesterday on labeling for over-the-counter drugs incorrectly described the American Pharmaceutical Association. It is a trade group representing pharmacists.

A FaceTime calendar listing in yesterday's TechThursday section incorrectly described the FOSE '99 Conference and Expo. The March 16-18 trade show at the Washington Convention Center will bring together more than 420 technology exhibitors and 22,000 military and civilian government employees who buy computer and communications products for their agencies. Admission is free for these government professionals.

An article Monday incorrectly identified the school whose researchers are studying a toxic lake near Butte, Mont. It is Montana Tech of the University of Montana.