EDWARD MATTERN Obituary (2018) - Crafton, PA - Pittsburgh Post-Gazette
20+ "Paul Mattern" profiles | LinkedIn
Trumpet Tune (arr. R. King and J. Mattern for brass quintet and organ) by Chicago Brass Quintet on Amazon Music - Amazon.com
Mattern – CBIOMES
522 Mattern Photos and Premium High Res Pictures - Getty Images
Andrew Mattern Facebook, Twitter & MySpace on PeekYou
Paul Sérusier. Program for The Assumption of Hannele Mattern (L'Assomption de Hannele Mattern) and Waiting for Him (En l'attendant) from The Beraldi Album of Theatre Programs. 1894 | MoMA