@book{26081,
	author = {Henderson, Junius,},
	title = {The cretaceous formations of northeastern Colorado and the foothills formations of north-central Colorado,},
	publisher = {Eames brothers, state printers,},
	year = {1920.},
	series = {Colorado. Geological survey. Bulletin 19},
	address = {Denver, Col.,},
	note = {At head of title: Colorado Geological survey, Boulder ...}
}