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21. County Boundary: San Mateo County, California, 2008

2008. County of San Mateo Information Services Department. This polygon shapefile depicts the county boundary for San Mateo County in California. This layer is part of a collection of GIS data for San Mateo... County of San Mateo Information Services Department.

22. County Boundary: Santa Cruz County, California, 2015

2015. Garcia, Paul and Price, Matt. This polygon shapefile depicts the boundary for the County of Santa Cruz, California. This coverage was drawn using mean high tide where available ... County of Santa Cruz Information Services Department.

23. Global Map: 1:1,000,000-Scale Political Areas of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile includes Global Map data showing the counties and equivalent entities of the United States, Puerto Rico, and the U.S. Virgin... National Atlas of the United States.

24. Political Boundary of Monterey County, California, 1994

1994. U.S. Census Bureau. This shapefile is a gross-level polygon of the Monterey County political boundary intended for general mapping and planning purposes. The exact sou... Monterey County (Calif.) Planning Department.

25. Polygon Mask: San Francisco Bay Area, California, 2011

2011. Bay Area Open Space Council, Conservation Lands Network, San Francisco Bay Area Upland Habitat Goals Project, and GreenInfo Network (Firm). This polygon shapefile depicts a mask of the nine county San Francisco Bay Area Region, California, onto which other thematic data can be layered. ... Bay Area Open Space Council.

26. Population by County, Census: China, 1953

1953. China. Guo jia tong ji ju, All China Marketing Research Co., Zhonghua di tu xue she, and University of Michigan. China Data Center. This polygon shapefile contains county boundaries and population data for China from the 1953 Census. These data were primarily based on "The Histo... University of Michigan. China Data Center.

27. Registration Counties of England and Wales, 1851

1851. Southall, Humphrey, Aucott, Paula, Bennett, Chris, and University of Portsmouth. These are digital boundaries for the system of counties used in England and Wales for vital registration and also for the administration and report... University of Portsmouth.

28. Registration Counties of England and Wales, 1861

1861. Southall, Humphrey, Aucott, Paula, Bennett, Chris, University of Portsmouth, and Great Britain Historical Geographical Information System. These are digital boundaries for the system of counties used in England and Wales for vital registration and also for the administration and report... University of Portsmouth.

29. Registration Counties of England and Wales, 1871

1871. Southall, Humphrey, Aucott, Paula, Bennett, Chris, University of Portsmouth, and Great Britain Historical Geographical Information System. These are digital boundaries for the system of counties used in England and Wales for vital registration and also for the administration and report... University of Portsmouth.

30. Registration Counties of England and Wales, 1881

1881. Southall, Humphrey, Aucott, Paula, Bennett, Chris, University of Portsmouth, and Great Britain Historical Geographical Information System. These are digital boundaries for the system of counties used in England and Wales for vital registration and also for the administration and report... University of Portsmouth.