TY  - RPRT
TI  - Devonian conodont biochronology in geologic time calibration
AU  - Charles Sandberg
AU  - W. Ziegler
PY  - 1996
DO  - 10.1007/bf03042852
UR  - https://pubs.usgs.gov/publication/70018075
ID  - 70018075
ER  -