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Joh. Ernesti Schaperi, Med. Dr. ... Dissertatio epistolica ad virum per-illustrem et excellentissimum Dn. Godfridum Guilielmum de Leibniz ... de hydrophthalmia intercepta / Quam ... autor ... proponit ... respondente Joh. Ludovico Schapero. Public Domain Mark. Source: Wellcome Collection.