• A timeline of events in the 2010 Census, accompanying a story on page A1 Monday, incorrectly described the planned efforts to contact people who don't return questionnaires by mail. About 1 million people hired by the U.S. Census Bureau will knock on doors to ask people to complete the surveys.

• Marlon Green, the first African-American hired as a pilot for a U.S. passenger airline, resigned his Air Force commission in 1957 after nine years of service and was honorably discharged. A story and accompanying photo caption on Page A1 of the Chronicle Feb, 10 contained incorrect information about his departure from the military and hiring by Continental Airlines.