The art of breathing as the basis of tone-production : a book indisensable to singers, elocutionists, educators, lawyers, preachers, and to all others desirous of having a pleasant voice and good health / by Leo Kofler.

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The art of breathing as the basis of tone-production : a book indisensable to singers, elocutionists, educators, lawyers, preachers, and to all others desirous of having a pleasant voice and good health / by Leo Kofler. Public Domain Mark. Source: Wellcome Collection.