Chemical commerce and its commodities : a valedictory address / by Prof. R. Welch, A.M., at commencement of Hahnemann Medical College, 1866.

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Chemical commerce and its commodities : a valedictory address / by Prof. R. Welch, A.M., at commencement of Hahnemann Medical College, 1866. Credit: 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.). Public Domain Mark