An academic history can be a large, multivolume work such as the Cambridge Modern History, written collaboratively under some central editorial control. In the 19th century, the idea appeared in universities that a definitive history could be written of a major region of the world for a great span of time in a similar manner to the way that an encyclopedia was written. The time period was subdivided into eras and one volume specified for each. Within each volume there would be a fixed number of topics. Either each volume would either be written by one historian on the faculty, or else each topic would be handled by a faculty member throughout the series of volumes, or perhaps another system of specialization would be prescribed. This procedure was similar to that undertaken on such campuse