Under what name were the Nancy Drew books written?

Nancy Drew is the fictional character created as the female counterpart to Edward Stratemeyer’s Hardy boys series. Her character first made an appearance in 1930 and has been written by several authors published collectively under the pseudonym Carolyn Keene. Nancy Drew is considered a cultural icon and is a strong influence cited by many distinguished women, from first lady Laura Bush, former Secretary of State Hillary Rodham Clinton, Sonia Sotomayor, and Supreme Court Justice Sandra Day O’Connor. In the early versions of the series, Nancy Drew is a 16-year-old high school graduate. In later versions, she is aged and re-written to be an 18-year-old detective and high school graduate.

Source: Adazing