The online catalogue raisonné was published by the Paul Mellon Centre. The catalogue lists 987 authentic oil paintings, watercolors, and sketches. The catalogue also includes lost works, unidentifable works, and several doubtful attributions. Finally, there is a separate section dealing with works by Towne's pupils and copyists. The catalogue can be searched by medium, date, title, subject, by exhibition, and status of the work. The publication also indices of people & organizations and current locations of works.