The three pieces of the Simples coletânea (Valsa Mistica, Num Berco Encantado, and Rhodante) were composed respectively in 1917, 1918, and 1919.
Listen to Sonia Rubinsky play Simples Coletanea at Mbaraka Músicas (click on Villa-Lobos: Brincando seriamente com piano).
The score is available at the IMSLP/Petrucci Music Library.
Solo piano
Villa-Lobos, Heitor. 1992. Simples coletânea: for solo piano. Master piano series. Boca Raton, Fla: Masters Music.
You can download the score at IMSLP.org.