found: His Melodien-Album, 189-?
found: His 30 easy studies, 1981:t.p. (Wilhelm Popp) t.p. verso (b. 1828; d. 1903)
found: His La chasse, c1984:t.p. (Popp) caption (Guill. Popp)
found: Pazdírek(Popp, Wilhelm (Guillaume))
found: Adorjan, A. András Andorjan [SR] 198-:label (Guill Popp)
found: His La traviata, c1999:t.p. (Wilhelm Popp) verso (b. Apr. 29, 1828, Coburg) caption (Wilh. Popp; d. 1903)
found: German Wikipedia, September 9, 2015(Wilhelm Popp; Wilhelm Albrecht Otto Popp; born April 29, 1828, Coburg; died June 25, 1903, Hamburg; German composer and flutist; also used a French form of his name, Guillaume Popp, and the pseudonym Henry Alberti)