The filtration of public water-supplies / Third edition, revised and enlarged.

by Allen Hazen

[22] Journal für Gas- und Wasserversorgung, 1887, p. 595.

[23] Zeitschrift für Hygiene, 1894, p. 172.

[24] Appendix IV.

[25] Appendix I.

[26] Glaser’s Annalen, 1886, p. 48; Zeit. f. Hygiene, 1889, p. 128.

[27] Vierteljahresschrift für öffentliche Gesundheitspflege, 1891, p. 59.

[28] Journal für Gas- und Wasserversorgung, 1891, 108.

[29] Zeitschrift für Hygiene, 1894, 182.

[30] I am informed that several other filters upon the same principle have been more recently built.

[31] Report on Water Purification at Cincinnati, page 378.