1. Quality of Water and Soap Consumption;Hudson;Jour. A.W.W.A.,1933
2. The Economic Effects of Quality of Water With Special Reference to Soap Consumption in the Home;Hudson,1933
3. A Summary of Census Data on Water Treatment Plants in the United States;Wiebei;Public Health Reports,1942
4. 1944 Census of U.S. Municipal Water Softening Plants;Olson;Jour. A.W.W.A.,1945
5. The Savings of Soap to a Household of Columbus, Ohio;Snyder,1927