county borough on which the metropolitan borough was based
the following text is based on an article in Wikipedia
The Metropolitan Borough of Doncaster is a metropolitan borough within the modern county of South Yorkshire. The borough was created on 1 April 1974, under the Local Government Act 1972. It was made a unitary authority in 1986. A map in Wikipedia shows that Doncaster covers the northeastern quarter of South Yorkshire.
The new borough was a merger of the principal settlement of Doncaster and a number of surrounding urban and rural districts. Unless specified, all the places listed were in the West Riding of Yorkshire prior to the formation of South Yorkshire in 1974.
In addition to the town of Doncaster, the borough covers the following urban and rural district councils:
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