Explore an evolving series maps, charts and other information products about Boston Harbor Islands. Click on the links below for full-sized PDF maps of vegetation and intertidal resources on the islands. These maps were produced by the NPS FTSC at the University of Rhode Island (February, 2010) using the following data sources: NatureServe. 2009. Draft National Vegetation Classification Data (labeled in black). Bell, R. 2003. BOHA Intertidal and Terrestrial Area Assessment (labeled in blue).