@book{27819,
	author = {Willman, H. B.},
	title = {Feldspar in Illinois sands, a study of resources,},
	year = {1942.},
	address = {Urbana, Illinois,},
	note = {At head of title: State of Illinois, Dwight H. Green, Governor. Dept. of Registration and Education, Frank G. Thompson, Director. Division of the State Geological Survey, M. M. Leighton, Chief, Urbana.}
}