@book{23247,
	author = {Barrows, Harlan H. and Koelsch, William A.},
	title = {Lectures on the historical geography of the United States as given in 1933 /},
	publisher = {The university of Chicago,},
	year = {1962.},
	series = {University of Chicago. Dept. of Geography. Research paper},
	address = {Chicago,}
}