TY  - RPRT
TI  - User's guide for GSREF; a personal computer bibliographic reference system; version 3.1
AU  - G.I. Selner
PY  - 1986
DO  - 10.3133/ofr86186
UR  - https://pubs.usgs.gov/publication/ofr86186
ID  - ofr86186
ER  -