@article{18227, recid = {18227}, author = {Parmelee, Cullen W. and Harman, Cameron Gerald, 1905-}, title = {Southern Illinois novaculite and novaculite gravel for making silica refractories,}, address = {Urbana, Ill.,}, pages = {55 p.}, year = {1946}, note = {At head of title: State of Illinois...Dept. of registration and education...Division of the State geological survey...}, url = {http://library.usi.edu/record/18227}, }