Standard methods for the examination of water and sewage

by American Public Health Association. Laboratory Section; American Chemical Society; Association of Official Agricultural Chemists

[68c]. pp. 106–9.

[69]. McGowan, George. Kjeldahl process for the estimation of total nitrogen and (indirectly) of total organic nitrogen: Royal Commission on Sewage Disposal, Vol. 4, pt. 5, pp. 24–31, 1904;

[69a]. pp. 37–41;

[69b]. pp. 47–8.

[70]. Palmer, A. W. Chemical survey of the waters of Illinois, Report for years 1897–1902, pp. 27–8, Univ. Ill., 1903.

[71]. ——. Report of the University of Illinois [in Report of streams examination, Sanitary Dist. Chicago], p. 60, Chicago, 1903;

[71a]. p. 56;

[71b]. pp. 61–4.

[72]. Parker, G. H. Report of the biologist: Examinations by the State Board of Health of water supplies of Mass., 1887–90, pt. 1, Examination of water supplies, pp. 583–7, 1890.

[73]. Parmelee, C. L., and Ellms, J. W. On rapid methods for the estimation of the weight of suspended matters in turbid waters: Tech. Quart., Vol. 12, pp. 145–64, 1899.