Report to the directors of the East London Water Works : being replies to a series of questions proposed by Dr. Southwood Smith, relative to the practicability and expediency of giving a constant supply : with an appendix, containing Mr. Wicksteed's report to the Health of Towns Commissioners, his letter to J.G. Shaw Lefevre, Esq., of the Board of Trade, and his letter to the chairmen of three provincial water works companies, on the same subject /