Remarks on the origin and mode of progression of yellow fever in Philadelphia based on the occurrence of the disease in that city and at the Lazaretto, in the months of July, August, and September, 1870 / by R. La Roche.

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Remarks on the origin and mode of progression of yellow fever in Philadelphia based on the occurrence of the disease in that city and at the Lazaretto, in the months of July, August, and September, 1870 / by R. La Roche. Public Domain Mark. Source: Wellcome Collection.