I have divided the 10 topics into three groups based on their features, and am developing three theme areas on the map by putting each group’s subjects together. Below are the groups:

Group001-Historical: (3) Historic Route 6 (6) Historic sites and landscapes 

Group002-Ecosystem: (5) Wastewater disposal (7) Energy futures (8) Water as asset and
threat (9) Habitat and corridors

Group003-Humanities: (1) Fall color tourism (2) Aging in place (4) Sense of place (10) Winners and losers