Located in Washington, Connecticut, the Institute for American Indian Studies (IAIS)—formerly the American Indian Archaeological Institute (AIAI)—was incorporated in 1975 as an outgrowth of local efforts to recover New England’s then-largely-unknown indigenous history.
Connecticut Museum of Culture and History - Homepage
This link is to the Research Tools page of the Society. The catalogs and subject guides available online are a great introduction to the many materials available for research at the Connecticut Historical Society.
On the Collections page a search is also an option.
The Dudley Farm Museum notes that is has a collection of Quinnipiac stone tools and arrowheads. Scroll down to the bottom of the page to see the entry for The Quinnipiac Dawnland Museum. An appointment may be needed to view the collection.
The University of Connecticut Library MAGIC (Map and Geographic Information Center), collaborates with agencies, organizations, and centers to provide the public with access to digital access to maps, atlases, aerial photographs, and geospatial data pertaining to the state of Connecticut, New England and the world.
Connecticut State Library homepage. There is an option to "Search this site" as well as other search avenues.
There also is a Native American Research page.