Intermarriage: or, the mode in which, and the causes why, beauty, health and intellect, result from certain unions, and deformity, disease and insanity, from others ... / [Alexander Walker].

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Intermarriage: or, the mode in which, and the causes why, beauty, health and intellect, result from certain unions, and deformity, disease and insanity, from others ... / [Alexander Walker]. Public Domain Mark. Source: Wellcome Collection.