Pg. 50, The voice : an introduction..., W.A.Aiken, 1910
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Pg. 50, The voice : an introduction..., W.A.Aiken, 1910. Wellcome Collection. Source: Wellcome Collection.
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: Pg. 50, The voice : an introduction..., W.A.Aiken, 1910. Wellcome Collection. Source: Wellcome Collection.