TY  - RPRT
TI  - GSREF version 4.0; a bibliographic reference system for the IBM PC and compatible microcomputers
AU  - G.I. Selner
AU  - R. B. Taylor
PY  - 1990
DO  - 10.3133/ofr90229
UR  - https://pubs.usgs.gov/publication/ofr90229
ID  - ofr90229
ER  -