The Spatial and Temporal Layers of Global History: A Reflection on Global Conceptual History through Expanding Reinhart Koselleck's Zeitschichten into Global Spaces Hagen Schulz-Forberg In: "Historical Social Research". Vol 38. Pp 40-58. 2013 1 theory and philosophy of historiography cyclical/linear fields of research geography/space interdisciplinarity time/temporality world/global/universal history