Three companies build business on used school textbooks , bound volumes . Better World Books brings in and sends out 40,000 to 50,000 books daily . CNN Producer Ben Tinker contributed to this report . Revenue has grown from $ 10 million in 2005 to a projected $ 31 million in 2009 . 5 to 10 percent of revenue donated to education , literacy programs .
Three companies build business on used school textbooks , bound volumes . Better World Books brings in and sends out 40,000 to 50,000 books daily . Revenue has grown from $ 10 million in 2005 to a projected $ 31 million in 2009 . 5 to 10 percent of revenue donated to education , literacy programs .