Retail sales at bookstores this past December are estimated at $2,051 million, a drop of 4.7 percent compared to the $2,152 million in bookstore sales for December 2007, according to statistics recently released by the Bureau of the Census. For the year, bookstore retail sales were $16.9 billion, down an estimated 0.5 percent compared to 2007. The Census Bureau also adjusted its preliminary estimates of November 2008 bookstore sales down slightly to $1,053 million, putting them at 13.0 percent below November 2007.