Investigation of the pollution and sanitary conditions of the Potomac watershed : with special reference to self purification and the sanitary condition of shellfish in the lower Potomac River / by Hugh S. Cumming. Plankton studies / by W.C. Purdy; and Hydrographic studies / by Homer P. Ritter.

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Due to essential maintenance, we won’t be able to retrieve items from our closed stores over the weekend. Please submit requests for Monday 20 April by 10:00 on Friday 17 April. The library will remain open as usual. Thank you for your understanding.

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Purdy, W. C. (William C.)

Works from the collections

Investigation of the pollution and sanitary conditions of the Potomac watershed : with special reference to self purification and the sanitary condition of shellfish in the lower Potomac River / by Hugh S. Cumming. Plankton studies / by W.C. Purdy; and Hydrographic studies / by Homer P. Ritter.