Williamson, Samuel H. (April 2010). Seven Ways to Compute the Relative Value of a U.S. Dollar Amount, 1774 to present. MeasuringWorth. Calculations made using Nominal GDP Per Capita, a measure of capital intensivity, using "the 'average' per-person output of the economy in the prices of the current year." This is a measure of the amount of capital and volume of labor required to reproduce the work over varying production methods, but assuming that money represents a proportion of the economy.
“Duties”. United Township Association of Indiana. 2011年1月6日閲覧。
“Government”. United Township Association of Indiana. 2011年1月6日閲覧。
usda.gov
soildatamart.nrcs.usda.gov
United States Department of Agriculture's Natural Resources Conservation Service (2003). Soil Survey of Fountain County, Indiana(PDF) (Report). U.S. Government Printing Office. 2010年10月9日時点のオリジナル(PDF)よりアーカイブ。2011年2月14日閲覧。
United States Department of Agriculture's Natural Resources Conservation Service (2003). Soil Survey of Fountain County, Indiana(PDF) (Report). U.S. Government Printing Office. 2010年10月9日時点のオリジナル(PDF)よりアーカイブ。2011年2月14日閲覧。