Dakota Johnson

May 22, 2012,
By JULIE BOSMAN

In case there was any doubt about the blockbuster success of the “Fifty Shades of Grey” trilogy by E L James, the numbers are in: more than 10 million copies of the books have been sold in the United States in six weeks, the publisher said on Tuesday, putting the books among some of the best-selling series in modern publishing.

“The sales velocity for ‘Fifty Shades of Grey’ is unprecedented, with reader demand still growing,” Anthony Chirico, the president of the Knopf Doubleday Publishing Group, said in a statement. “As we head into the heart of the...