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Credit
Progress of the Brosterian system for the effectual removal of impediments in speech, bad articulation, lisps, gutteral pronunciations, &c. : from which emanates an entire new art of reading and speaking / discovered by John Broster ... For the fourth year. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.