1: 1925-1935. - Barth, Karl, 1886-1968. (OLS)http://ftis/name/51150; Erler, Rolf-Joachim. (OLS)http://ftis/name/57313; Kirschbaum, Charlotte : von. (OLS)http://ftis/name/75214 (Karl Barth-Charlotte von Kirschbaum Briefwechsel, 2008)
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