From the longer Wikipedia page [https://en.wikipedia.org/wiki/Parts_of_Holland
The Parts of Holland is a historical subdivision used in south-east Lincolnshire, England from 1889 to 1974. The name is still recognised locally and survives in the district of South Holland.
Parts of Holland was one of the three medieval subdivisions or 'Parts' of Lincolnshire (the other two were Lindsey and Kesteven) which had long had separate county administrations (quarter sessions). Under the Local Government Act 1888 it obtained a county council, which it retained until 1974. At that point the three county councils were abolished and Lincolnshire (minus the northern part of Lindsey) had a single county council for the first time.
Before the changes of 1888, Holland had, since probably the tenth century, been divided into the three wapentakes of Elloe, Kirton and Skirbeck.
Under the Local Government Act 1894 it was divided into rural districts and urban districts, with the municipal borough of Boston remaining untouched. The rural districts were Boston, Crowland, East Elloe and Spalding, whilst Holbeach, Long Sutton, Spalding and Sutton Bridge became urban districts. In 1932, the Crowland RD (which consisted of the single parish of Crowland) was abolished and added to Spalding RD, and all urban districts apart from Spalding were abolished and added to East Elloe Rural District.