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(December 1998). “The Tallest in the World: Native Americans of the Great Plains in the Nineteenth Century”. NBER Historical Working Paper No. 112. doi:10
October 2014閲覧。 ^ “Inside the Christian Militias Defending the Nineveh Plains”. Warisboring (7 March 2015). 2016年9月15日時点のオリジナルよりアーカイブ。8 January 2017閲覧。
“Processes of humus formation and transformation in soils of the Canadian Great Plains”. European Journal of Soil Science 30 (1): 77-84. doi:10.1111/j.1365-2389