[22]. Fitzgerald, and Foss, Report Boston Water Board, p. 86, 1893.
[23]. Forbes, F. B., and Pratt, G. H. The determination of carbonic acid in drinking water: J. Am. Chem. Soc., Vol. 25, pp. 742–56, 1903.
[24]. Fowler, G. J. Sewage works analyses, pp. 21–37, John Wiley & Sons, New York, 1902;
[24a]. pp. 31–4;
[24b]. pp. 58–60;
[24c]. pp. 86–9;
[24d]. pp. 89–95;
[24e]. pp. 96–7;
[24f]. pp. 98–100.
[26]. Fowler, G. J. Univ. of Manchester Lecture, March, 1904, Pamphlet, p. 7.