@article{gray_study_2011,
	title = {The study of human progress and the buildup of civilization},
	volume = {36},
	url = {http://www.worldcat.org/oclc/11228546},
	number = {3},
	journal = {NAMTA Journal},
	author = {Gray, Shekkola and McNamara, John},
	year = {2011},
	pages = {227--239}
}

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