TY  - RPRT
TI  - FORMATIONTOPS (version 1); a system to retrieve formation tops data
AU  - C. J. Wandrey
AU  - R. C. Obuch
PY  - 1990
DO  - 10.3133/ofr90530
UR  - https://pubs.usgs.gov/publication/ofr90530
ID  - ofr90530
ER  -