"This concise edited volume explores the economic relations between the Dutch Port of Rotterdam and the German Ruhr district from the end of the 19th to the beginning of the 21st century. The volume is an excellent example of a successful small-scale project in historical research. The three planned PhDs have been duly delivered, and the project initiators have lived up to their promise of writing an accessible and compact synthesis." — Nico Randeraad: Rezension zu: Boon, Marten; Klemann, Hein A.M.; Wubs, Ben (Hrsg.): Transnational Regions in Historical Perspective London 2020. ISBN 9781138670853, in: Connections. A Journal for Historians and Area Specialists, 17.12.2021, .