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.
The Native Northeast Research Collaborative (formerly The Yale Indian Papers Project) is an inclusive digital humanities endeavor that engages tribes, scholars, educators, students, and the general public in the study of the Native presence in the Atlantic Northeast.
Connecticut Digital Archive: The CTDA is part of the Digital Preservation Repository Program at the University of Connecticut. We serve the entire state and are dedicated to the maintenance, delivery, and preservation of a wide range of digital resources for educational and cultural institutions and State Agencies in Connecticut.
This link to the Connecticutt Digital Archive opens to the results for searching the phrase Native Americans.
Mashantucket Pequot Museum and Research Center
The Pequot Museum is committed to transforming how indigenous culture and peoples are represented to accurately portray a next generation Native narrative that gives greater understanding to the evolution of a new Native voice.
Library of Congress homepage. The Library of Congress is the largest library in the world, with millions of books, recordings, photographs, newspapers, maps and manuscripts in its collections.