A treatise on ventilators [Microform] : wherein an account is given of the happy effects of the several trials that have been made of them, in different ways and for different purposes : which has occasioned their being received with general approbation and applause, on account of their utility for the great benefit of mankind : as also of what farther hints and improvements in several other useful ways have occurred since the publication of the former treatise / by Stephen Hales.
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