American Encyclopedia of Social History Ref. HN57 .E58 1993
Encyclopedia of European Social History from 1350 to 2000 Ref. HN373 .E63 2001
The Timetables of History: a Horizontal Linkage of People and Events Ref. D11 .G78 1991
Oxford Reference Online: Timelines
HeritageQuest is designed for genealogical research, but provides interesting census data and online local and family histories.