September 11

There are many children's books to explain, review, recognize this day in lots of different ways. 
Check out these links - http://www.apples4theteacher.com/holidays/911/kids-books/, http://rakstagemom.wordpress.com/2011/09/07/911-books-for-children/,
http://sandysprings.macaronikid.com/article/175671/childrens-books-about-911

This book deals just with the NYC attack - "September 11, 2001: Attack on New York City, a nonfiction children's book about the terrorist attacks on New York City is the result of author Wilborn Hampton's desire to help younger readers understand what happened on September 11, 2001 in New York City. Hampton does this through photographs, interviews and an account of his own experiences that day and the days afterward."