TY  - RPRT
TI  - Lower Middle Ordovician stratigraphy of the Shenandoah Valley, Virginia
AU  - B.N. Cooper
AU  - G.A. Cooper
PY  - 1946
DO  - 10.1130/0016-7606(1946)57[35:lmosot]2.0.co;2
UR  - https://pubs.usgs.gov/publication/70198516
ID  - 70198516
ER  -