TY  - RPRT
TI  - Geologic Map of the Helen Planitia Quadrangle (V-52), Venus
AU  - Ivan Lopez
AU  - Vicki L. Hansen
PY  - 2008
DO  - 10.3133/sim3026
UR  - https://pubs.usgs.gov/publication/sim3026
ID  - sim3026
ER  -