collective record group
an artificial collection of records assembled from a number of relatively small or short-lived agencies that have an administrative or functional relationship.
Within a collective record group, each agency's records are usually segregated as a subgroup or series.
Holmes 1964, 26 The records of small though essentially independent satellite agencies were often included with the records of major agencies to which they were related. Many smaller fonds, such as the records of claims commissions or arbitration boards, were grouped together in what became known as 'collective record groups,' of which a number were established. There would otherwise be thousands of fonds.