1. The Helen Planitia region of Venus in four map sheets Author/Creator: Geological Survey (U.S.), issuing body Publication/Creation: Denver, Colorado : For sale by USGS Information Services Resource Type: Map Access & Availability: Loading
2. High-resolution marine geologic maps showing sediment distribution on the insular shelf off Luquillo, Puerto Rico Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading