These are digital boundaries for the system of counties essentially created by the 1889 Local Government Act and continuing to exist until 1974. Their initial primary focus was the administration of education. During the twentieth century, they can be treated as aggregates of local government districts, although note that administratively County Boroughs were independent of the counties they were geographically part of. This file represents the system as it was used to report the 1921 Census of Population, and does not separately identify County Boroughs. Statistical data and other information used in “A Vision of Britain through Time” can be accessed here: http://www.visionofbritain.org.uk/data. This dataset is intended for researchers, students, and policy makers for reference and mapping purposes, and may be used for basic applications such as viewing, querying, and map output production, or to provide a basemap to support graphical overlays and analysis with other spatial data. Great Britain Historical GIS Project. (2009). Administrative Counties of England and Wales, 1921 . University of Portsmouth. Available at: http://purl.stanford.edu/fr509mt1087 Gregory, I, Bennett, C, Gilham, V., and Southall, H. 2002. The Great Britain Historical GIS Project: from maps to changing human geography.' The Cartographic Journal, Vol. 39, No. 1, p. 37-49. Southall, H 2012, 'Rebuilding the Great Britain Historical GIS, part 2: a geo-spatial ontology of administrative units' Historical Methods: A Journal of Quantitative and Interdisciplinary History, vol 45, no. 3, pp. 119-134. DOI: 10.1080/01615440.2012.664101 For full details see License document included with this layer This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.