Ewing, John, Rev.

A dissertation on the sources of malignant bilious, or yellow fever, and means of preventing it. Submitted to the examination of the Rev. John Ewing, S.T.P. provost; the trustees & medical faculty, of the University of Pennsylvania, on the sixth day of June, 1799, for the degree of Doctor of Medicine / By William G. Chalwill, of Tortola, member of the Philadelphia Medical and Chemical Societies.