| Actor | Actor | Number of letters | From | to | |
|---|---|---|---|---|---|
| Barth, Karl | Thurneysen, Eduard | 1572 | 0 | 1968 | |
| Barth, Anna | Barth, Karl | 1073 | 1894 | 1963 | |
| Kirschbaum, Charlotte von | Traub, Hellmut | 714 | 0 | 1965 | |
| Kirschbaum, Charlotte von | Staewen, Gertrud | 667 | 0 | 1965 | |
| Barth, Karl | Kirschbaum, Charlotte von | 665 | 0 | 1967 | |
| Barth, Fritz | Barth, Karl | 563 | 1893 | 1912 | |
| Kirschbaum, Charlotte von | Wolf, Ernst | 552 | 0 | 1965 | |
| Kirschbaum, Charlotte von | Lentrodt, Emmy | 548 | 0 | 1942 | |
| Kirschbaum, Charlotte von | Seifert, Katharina | 539 | 0 | 1965 | |
| Barth, Karl | Schmidt, Karl Ludwig | 510 | 1921 | 1953 | |
| Barth, Karl | Lindt-Barth, Gertrud | 481 | 0 | 1968 | |
| Barth, Karl | Barth, Peter | 463 | 1899 | 1940 | |
| Barth, Karl | Merz, Georg | 439 | 1917 | 1959 | |
| Barth, Karl | Christian Kaiser Verlag | 418 | 1920 | 1968 | |
| Kirschbaum, Charlotte von | Schwenzel, Liselotte | 406 | 0 | 1966 | |
| Barth, Karl | Evangelischer Verlag Zürich (EVZ) | 354 | 1937 | 1968 | |
| Barth, Karl | Keller, Adolf | 306 | 1914 | 1963 | |
| Barth, Karl | Barth, Markus | 291 | 0 | 1968 | |
| Kirschbaum, Charlotte von | Küppers, Erica | 281 | 0 | 1961 | |
| Barth, Karl | Lempp, Albert | 278 | 1919 | 1938 | |
| Barth, Karl | Sartorius, Ernst | 265 | 1893 | 1957 | |
| Kirschbaum, Charlotte von | Pestalozzi, Gerty | 265 | 0 | 1964 | |
| Barth, Karl | Wolf, Ernst | 262 | 0 | 1968 | |
| Kirschbaum, Charlotte von | Röhrig, Martha | 250 | 0 | 1954 | |
| Kirschbaum, Charlotte von | Steck, Karl Gerhard | 245 | 0 | 1962 | |
| Barth, Karl | Christ, Lukas | 244 | 1915 | 1958 | |
| Barth, Karl | Frey, Arthur | 244 | 0 | 1955 | |
| Barth, Karl | Pestalozzi, Rudolf | 242 | 1912 | 1961 | |
| Kirschbaum, Charlotte von | Simon, Lili | 238 | 0 | 1965 | |
| Kirschbaum, Charlotte von | Scholz, Heinrich | 227 | 1929 | 1956 | |
| Gollwitzer, Helmut | Kirschbaum, Charlotte von | 224 | 0 | 1963 | |
| Barth, Karl | Vogt, Paul | 220 | 0 | 1968 | |
| Barth, Karl | Schweizerische Kreditanstalt | 210 | 0 | 1964 | |
| Barth, Karl | Rade, Martin | 199 | 1908 | 1940 | |
| Barth, Karl | Loew, Wilhelm | 198 | 1909 | 1967 | |
| Barth, Christoph | Barth, Karl | 197 | 1924 | 1968 | |
| Barth, Karl | Niesel, Wilhelm | 197 | 1924 | 1968 | |
| Barth, Karl | von Erlach, Albert | 197 | 1942 | 1968 | |
| Freiling, Elisabeth | Kirschbaum, Charlotte von | 194 | 0 | 1965 | |
| Barth, Karl | Lauterburg, Otto | 187 | 1901 | 1968 | |
| Kirschbaum, Charlotte von | Traub, Aenne | 186 | 0 | 1961 | |
| Barth, Karl | Brunner, Emil | 185 | 0 | 1966 | |
| Barth, Karl | Steck, Karl Gerhard | 181 | 1930 | 1968 | |
| Barth, Karl | Hesse, Hermann Albert | 177 | 1925 | 1957 | |
| Barth, Karl | Zulauf, Fritz | 171 | 1906 | 1965 | |
| Barth, Karl | Visser ’t Hooft, Willem Adolf | 168 | 1930 | 1968 | |
| Freudenberg, Elsa | Kirschbaum, Charlotte von | 166 | 0 | 1964 | |
| Kirschbaum, Charlotte von | Traub, Gottfried | 161 | 0 | 1954 | |
| Kirschbaum, Charlotte von | Merz, Georg | 161 | 0 | 1959 | |
| Barth, Karl | Scholz, Heinrich | 158 | 1929 | 1956 |
1 to 50 from 205 Entries