1. U. S. Geol. S;Clarke,1924
2. COLORIMETRIC DETERMINATION OF HYDROGEN-ION CONCENTRATION WITHOUT BUFFER MIXTURES, WITH ESPECIAL REFERENCE TO SOILS
3. 1929, “The Victoria Nyanza and its Fisheries.” Crown Agents for the Colonies, London.
4. 1925, “The Lake plateau basin of the Nile, I.” Government press, Cairo.
5. and , 1924, “The hydrogen-Ion concentration of certain Wisconsin lake waters.” Trans. Amer. Miscroscop. Soc., 1924. p. 177.