found: Rangström, T. Ur Kung Eriks visor [SR] 1976 (a.e.)label (Walton Grönroos, baritone)
found: Tchaikovsky, P. Yolanta [SR] p1986:container (Walton Groenroos, sings role of Robert)
found: Int. ww in mus., 13th ed.(Gronroos, Walton; b. 1940, Aland Islands, Finland; baritone, administrator)
found: Kutsch/Riemens. Grosses Sängerlexikon, 1987-1994(Grönroos, Walton; b. 1940, Aland Islands; baritone)
found: Int. ww in mus., 14th-16th eds.(Gronroos, Walton; b. 1939, Aland Islands, Finland; baritone, administrator)
found: Notes, June 2000:p. 917 (Grönroos, Walton; d. Mar. 19, 1999, at 59, Stockholm, Sweden; Finnish baritone and opera director)
found: Bach cantatas website, viewed January 17, 2019(Walton Grönroos (baritone); born August 29, 1939, Finström, Åland Islands, Finland; died March 19, 1999, Stockholm, Sweden; Finnish bass)
found: Finnish Wikipedia, viewed January 17, 2019(Walton Grönroos; Hugo Walton Grönroos; born August 29, 1939, Finström, Åland; died March 19, 1999, Stockholm; Finnish baritone)
notfound: Baker's dict. of opera;New Grove dict. of opera.