The Boston Fire Historical Society has an extensive collection of information, as does the Boston Public Library. The BPL's collection includes witness statements released by the Boston Police Department.
The Cocoanut Grove fire has always fascinated me. It had significant impact on Boston as a city and on how fires are handled around the country. From the Grove fire came new building safety codes, new techniques for treating burn victims, and many other small changes that have made their way into our daily lives. I'm not 100% sure why the fire has fascinated me so, but I am interested in Boston history, especially the history of the period from the 30-50 years before I was born.