RT Review T1 Baum, Gregory, "That they may be One": A Study of Papal Doctrine (Leo XIII.-Pius XII.) JF Ökumenische Rundschau VO 8 IS 4 SP 215 OP 216 A1 Mumm, Reinhard 1916-1986 LA German YR 1959 UL https://ixtheo.de/Record/1925385620 K1 Rezension DO 10.71860/kr.v8i4.119578