1. Bedrock geologic map of the Gloucester and Rockport quadrangles, Essex County, Massachusetts Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by U.S. Geological Survey, Map Distribution Resource Type: Map Access & Availability: Loading
2. Lithologic map of the western part of the Springerville volcanic field, east-central Arizona Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading