Check out this blog post at Harvard Law:

Waterboarding in History: A lesson dedicated to Schumer and Feinstein

From the post:

Brasil: Nunca Mais is a study of state repression during the Brazilian military dictatorship from 1964-1985. Undertaken clandestinely by a team of lawyers, clergymen, and others, the study is based entirely on the Brazilian government’s own records of interrogations, disappearances, and other operations taken on in the name of national security. The documents were photocopied secretly until the archives of the Supreme Military Tribunal were reproduced. To date, the identity of many of the project’s participants is unknown. The book was first published in 1985, the final year of the Brazilian dictatorship. It is an abridged version of the complete work, which is over 5,000 pages long.