TY  - RPRT
TI  - Upper Devonian biostratigraphy of Michigan Basin
AU  - R.C. Gutschick
AU  - Charles Sandberg
PY  - 1991
DO  - 10.1130/spe256-p155
UR  - https://pubs.usgs.gov/publication/70206857
ID  - 70206857
ER  -