The Victoria County History of Suffolk.
Two volumes appeared in 1907 and 1911, partly researched by Lillian Redstone (1885-1955). Suffolk set up a county committee in 1907 consisting of local nobility, gentry, mayors and leading churchmen together with several practising historians.
Part of Volume II, detailing the county's medieval religious houses, is available on British History Online. For full access to all volumes, check your local library catalogue or your local archive.