A [PDF scan of the **1961 *Graduale Romanum***][1] is available from the [Church Music Association of America (CMAA)][2]. So is the [1961 *Liber Usualis*][3]. (cf. CMAA's [Music PDFs][4] and [Book PDFs][5]) [GregoBase][6] is a comprehensive database of Gregorian chants. [1]: http://media.musicasacra.com/pdf/graduale1961.pdf [2]: https://musicasacra.com/ [3]: http://media.musicasacra.com/pdf/liberusualis.pdf [4]: https://musicasacra.com/music/ [5]: https://musicasacra.com/literature/ [6]: https://gregobase.selapa.net/