Rembrandt's work can be found in many European and American museums. The best collections are in Amsterdam, Berlin, The Hague, St. Petersburg, New York City, and Washington, D.C. The Louvre, the British Museum, and the Rijksmuseum have good collections of his etchings and drawings. In 1968 a group of eminent Dutch scholars under the sponsorship of the Netherlands Organization for the Advancement of Scientific Research formed a committee to reassess the authenticity of works attributed to Rembrandt and compile a complete critical catalog of his paintings. Known as the Rembrandt Research Project (RRP), it has used a variety of sophisticated analytical techniques and has substantially reduced the number of paintings definitely considered to have been painted by the artist. By the end of the 20th cent. the RRP had produced three volumes of an anticipated five-volume work entitled A Corpus of Rembrandt Paintings.