His Repertorium repertorii, 1901: t.p. (Clemens Blume, S.J.)
OCLC data base, 11-2-92 (hdg.: Blume, Clemens, 1862-1932)
Wikipedia 8 December 2021: (Clemens Blume (31 January 1862 - 1932) was a Jesuit hymnologist. He was born in Billerbeck (Germany), educated at Jesuit schools and scholasticates in Austria, Netherlands and England, and universities in Prague and Bonn. He entered the Jesuits in 1878 and was ordained priest in 1893. His special field was hymnology.)https://en.wikipedia.org/wiki/Clemens_Blume
Mendizabal, R. Catalogus defunctorum, 1972: (pater Blume, Clem. born 29-1-1862, Billerbeck (Westfalia); died 8-4-1932, Königstein (Taunus, Hessen-Nassau) prov. Germ.I.)