The collection of 461 Sorry Books has powerful historical and social significance as the personal responses of hundreds of thousands of Australians to the unfolding history of the Stolen Generations. Many more Sorry Books dating from the 1998 campaign are yet to be located, but it is estimated that the entire movement generated perhaps half a million signatures. This represents a "people's apology" for past wrongs to Indigenous Australians, and a vast public expression of opposition to Government refusal to make a formal apology.