TY  - RPRT
TI  - Changes in stratigraphic nomenclature by the U. S. Geological Survey, 1977
AU  - N. F. Sohl
AU  - W.B. Wright
PY  - 1978
DO  - 10.3133/b1457a
UR  - https://pubs.usgs.gov/publication/b1457A
ID  - b1457A
ER  -