SELYA, Circuit Judge.
The appeal before us represents yet another march in a litigatory trek of unusual length and complexity. We recount the case's by-now-familiar itinerary and thereafter proceed to blaze what few new trails remain.
I
The litigation concerns claims made by residents of the Aberjona River Valley in Woburn, Massachusetts. These residents contend that certain toxic chemicals in the city's water supply (the "complaint chemicals") caused...
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