TY  - RPRT
TI  - Thickness and lithology of Upper Ordovician and Lower and Middle Silurian rocks in the Michigan basin
AU  - G. V. Cohee
PY  - 1948
DO  - 10.3133/oc33
UR  - https://pubs.usgs.gov/publication/oc33
ID  - oc33
ER  -