RG 1141921General Register Office: 1921 Census Plans of Division
Plans of Division are used by Census Officers (usually Local Registrars) to record how their registration sub-district would be divided up into enumeration districts for the census.
In urban areas they list which streets are in which enumeration districts, and even which part of a street, or range of house numbers from a street fall into a given enumeration district.
In rural areas they indicate which hamlets and outlying farms were included in a particular enumeration district.
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