@book{29342,
	author = {Johnson, William David, and Kunkel, Robert Paul,},
	title = {The Square Buttes coal field, Oliver and Mercer Counties, North Dakota,},
	publisher = {U.S. Govt. Print. Off.,},
	year = {1959.},
	address = {Washington,},
	note = {Part of illustrative matter in pocket.}
}