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Credit
A practical treatise on gas and ventilation : with special relation to illuminating, heating, and cooking by gas : including scientific helps to engineer-students and others / by E. E. Perkins. Public Domain Mark. Source: Wellcome Collection.
Provider
This material has been provided by the National Library of Medicine (U.S.), through the Medical Heritage Library. The original may be consulted at the National Library of Medicine (U.S.)