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25981. An inaugural essay on the use of artificial drains: in the prevention and cure of disease : submitted to the examination of the Rev. J. Andrews ... Trustees & medical professors of the University of Pennsylvania, on the twenty-first day of April, 1806 : for the degree of Doctor of Medicine

25987. A system of natural philosophy: in which are explained the principles of mechanics, hydrostatics, hydraulics, pneumatics, acoustics, optics, astronomy, electricity, magnetism, steam-engine, electro-magnetism, electrotype, photography, and daguerreotype : to which are added questions for the examination of pupils, designed for the use of schools and academies