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Former US secretary of state Hillary Clinton smiles during a book signing for her book "Hard Choices" at a Waterstones book store in London on Thursday, July 3, 2014 Image Credit: Reuters

Hillary Rodham Clinton’s book Hard Choices is on track to be one of the year’s top nonfiction books despite another slip in sales.

Nielsen BookScan says Hard Choices sold 26,000 copies during its third week of publication.

Clinton’s memoir about her years as America’s secretary of state was published on June 10 and sold more than 80,000 copies the first week and nearly 50,000 the second week. The numbers don’t include e-book sales, which comprise around 30 per cent of the overall market.

Hard Choices has been the No 1 selling nonfiction hardcover on The New York Times list for three straight weeks but has slipped on Amazon.com, ranking No 57 as of Thursday night.

Clinton’s Living History was published in 2003 and sold more than 1 million copies.