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21. Marine Mammals Sightings Per Unit Effort, 1979-2007

1979. Nature Conservancy (U.S.). Geospatial data obtained from the United States Navy included point shapefiles of valid sightings for all marine mammal targets and pre-calculated ... Northeast Ocean Data.

22. Shellfish Habitats for Maine, Massachusetts, and New Hampshire, 1975-2013

1975. Nature Conservancy (U.S.). This shellfish habitat layer was derived from datasets from Maine, Massachusetts and New Hampshire state GIS resources. Shapefiles downloaded/provi... Northeast Ocean Data.