Lecture on scientific voice production and breathing exercises : their relation to health / delivered by Cortlandt MacMahon.

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Credit

Lecture on scientific voice production and breathing exercises : their relation to health / delivered by Cortlandt MacMahon. In copyright. Source: Wellcome Collection.

Provider

This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.