[32] Translation in German in Dingler’s Polytechnical Journal, 1832, 386.
[33] Water Purification at Louisville, page 378.
[34] Special Report Mass. State Board of Health 1890, Purification of Sewage and Water, page 747.
[35] Water Purification at Cincinnati, p. 485.
[36] Jour. of the New England Water Works Assoc., Vol. VIII, page 183.
[37] Report of the Pittsburg Filtration Commission, 1899, page 55.
[38] Rhode Island State Board of Health Report for 1894.
[39] Report of the Rhode Island State Board of Health for 1894.
[40] Report on the Investigations into the Purification of the Ohio River Water at Louisville, Kentucky. D. Van Nostrand & Co., 1898.
[41] Ohio State Board of Health Report, 1897, page 154.