http://lod.ehri-project-test.eu/isCopyOfRelations/f9b34d60-1c0b-11ef-983a-9d9be3570543 an entity of type: IsCopyOfRelation
"Documentation of the Reichsvereinigungen und Gemeinschaften (Reich Economic Unions), Germany, 1933-1945" was copied from "Reichsvereinigung Eisen"