(By HILLEL ITALIE, AP National Writer) The missing sales numbers are coming back on Amazon.com.Two days after Amazon said a "glitch" had caused the sales rank to be dropped from thousands of books, the numbers returned Tuesday for Annie Proulx's "Brokeback Mountain," James Baldwin's "Giovanni's Room" and other notable titles.Some authors whose rankings were dropped have posted messages from Amazon that said their books had been categorized as "Adult" and were being removed from some best-seller lists and search functions.