00707nam 2200265z- 450 991070820100332120241218120540.0(CKB)3780000000217392(DcWaBHL)45461(EXLCZ)99378000000021739220240129c1905uuuu -u- -engThe fluorspar deposits of southern IllinoisWashington, [D.C.]Govt. Print. Off19051 online resourceFluorsparGeologyIllinoisFluorsparGeologyDLCBOOK9910708201003321The fluorspar deposits of southern Illinois4447228UNINA