https://imslp.org/wiki/Heckelphone_Sonata%2C_Op.1699_(Beatty%2C_Stephen_W.)
Heckelphone Sonata, Op.1699 (Beatty, Stephen W.) - IMSLP
beatty stephenheckelphonesonataop1699
https://imslp.org/wiki/Heckelphone_Sonata%2C_Op.1661_(Beatty%2C_Stephen_W.)
Heckelphone Sonata, Op.1661 (Beatty, Stephen W.) - IMSLP
beatty stephenheckelphonesonataop1661
https://imslp.org/wiki/Heckelphone_Sonata%2C_Op.1696_(Beatty%2C_Stephen_W.)
Heckelphone Sonata, Op.1696 (Beatty, Stephen W.) - IMSLP
beatty stephenheckelphonesonataop1696
https://imslp.org/wiki/Solo_for_Heckelphone%2C_Op.1052_(Beatty%2C_Stephen_W.)
Solo for Heckelphone, Op.1052 (Beatty, Stephen W.) - IMSLP
beatty stephensoloheckelphoneop1052
https://imslp.org/wiki/Solo_for_Heckelphone%2C_Op.1044_(Beatty%2C_Stephen_W.)
Solo for Heckelphone, Op.1044 (Beatty, Stephen W.) - IMSLP
beatty stephensoloheckelphoneop1044
https://imslp.org/wiki/Solo_for_Heckelphone,_Op.1909_(Beatty,_Stephen_W.)
Solo for Heckelphone, Op.1909 (Beatty, Stephen W.) - IMSLP
beatty stephensoloheckelphoneop1909