J.Mc Mahel 1885 .pdf

C.E.Mincks 1905 .pdf

J.R.Combs 1912 .pdf

E.O.Cook 1918 .pdf

G.B.Dusinberre 1922 . pdf

G.B.Dusinberre 1926 .pdf

H.W.Pidgeon 1930 .pdf

M.Escalante 1931 .pdf

T.W.Rabb 1977 .pdf

Spence 1976 oral cavity .pdf

johnson didge 1976 .pbf

Adjustable reed

Overtone table .pdf