Local history is the study of history in a geographically local context, often concentrating on a relatively small local community. It incorporates cultural and social aspects of history. Local history is not merely national history writ small but a study of past events in a given geographical area which is based on a wide variety of documentary evidence and placed in a comparative context that is both regional and national. Historic plaques are one form of documentation of significant occurrences in the past and oral histories are another.