@book{24525,
	author = {Irving, J. D.},
	title = {A contribution to the geology of the northern Black Hills.},
	publisher = {[s.n.]},
	year = {1899.},
	series = {Contributions from the Geological department of Columbia university.},
	address = {[New York]},
	note = {From Annals New York academy of sciences, vol. XII, no. 9.}
}