This document discusses the use of primary sources for research and provides examples of online sources for primary materials about Connecticut history. It defines primary sources as first-hand accounts of history that include manuscripts, photographs, diaries, oral histories, and data sets. It notes that primary sources are now widely available online through websites run by archives, libraries, museums, and historical societies. The document encourages using primary sources to develop critical thinking skills, understand local history, acquire empathy, and understand different perspectives. It lists several authoritative online sources for Connecticut primary materials, including the Library of Congress, Connecticut History Online, the Connecticut State Library, and the Connecticut Historical Society.