http://lod.ehri-project-test.eu/isCopyOfRelations/36872acd-1919-11f0-a5c6-e3d285ab5c44 an entity of type: IsCopyOfRelation
"Documentation of the Reichsvereinigungen und Gemeinschaften (Reich Economic Unions), Germany, 1933-1945" was copied from "Reichsvereinigung Eisen"