1. Bedrock geologic map of the Ipswich quadrangle, Essex County, Massachusetts Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading
2. Bedrock geologic map of the Marblehead North quadrangle, Essex County, Massachusetts Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by Map Distribution Resource Type: Map Access & Availability: Loading