TY  - BOOK
AU  - Bevan,Arthur Charles
TI  - The Glenwood beds as a horizon marker at the base of the Platteville formation,
AV  - QE662 .B4
PY  - 1926///
CY  - Urbana, Ill.
KW  - Geology, Stratigraphic
KW  - Ordovician
KW  - Geology
KW  - Illinois
N1  - At head of title: State of Illinois. Department of registration and education. Division of state geological survey; Bibliographical foot-notes
ER  -