@book{25577,
	author = {Condra, Geo. E. and Bengtson, N. A.},
	title = {The Pennsylvanian formations of southeastern Nebraska,},
	year = {1915.},
	series = {Nebraska academy of sciences. Publications.},
	address = {[Lincoln?]},
	note = {At head of title: Nebraska physical and social science series.}
}