Climate of the Past, Vol 15, Pp 2053-2065 (2019) Burgdorf, Angela-Maria; Brönnimann, Stefan; Franke, Jörg (2019). Two types of North American droughts related to different atmospheric circulation patterns. Climate of the past, 15(6), pp. 2053-2065. Copernicus Publications 10.5194/cp-15-2053-2019 Climate of the Past