https://www.usgs.gov/media/images/inset-usgs-imap-1851-geologic-map-maasaw-patera-area-io
Inset of USGS IMAP 1851: Geologic map of the Maasaw Patera area of IoBy H. J. MooreMap and associated documents available from the USGS Publications Warehouse:...
geologic mapinsetusgsimapmaasaw