| Identifier | Title | Date | Level of description | Other information | |
|---|---|---|---|---|---|
| KBA 9375.224 | Fritz Barth an Karl Barth | 2nd Sep 1910 | Item: 1 letter | digitized | |
| KBA 9375.225 | Fritz Barth an Karl Barth | 13th Sep 1910 | Item: 1 letter | digitized | |
| KBA 9375.226 | Fritz Barth an Karl Barth | 26th Sep 1910 | Item: 1 letter | digitized | |
| KBA 9375.227 | Fritz Barth an Karl Barth | 10th Oct 1910 | Item: 1 letter | digitized | |
| KBA 9375.228 | Fritz Barth an Karl Barth | 18th Oct 1910 | Item: 1 letter | digitized | |
| KBA 9375.229 | Fritz Barth an Karl Barth | 24th Oct 1910 | Item: 1 letter | digitized | |
| KBA 9375.230 | Fritz Barth an Karl Barth | 26th Oct 1910 | Item: 1 letter | digitized | |
| KBA 9375.231 | Fritz Barth an Karl Barth | 28th Oct 1910 | Item: 1 letter | digitized | |
| KBA 9375.232 | Fritz Barth an Karl Barth | 4th Nov 1910 | Item: 1 letter | digitized | |
| KBA 9375.233 | Fritz Barth an Karl Barth | 10th Nov 1910 | Item: 1 letter | digitized | |
| KBA 9375.234 | Fritz Barth an Karl Barth | 16th Nov 1910 | Item: 1 letter | digitized | |
| KBA 9375.235 | Fritz Barth an Karl Barth | 23rd Nov 1910 | Item: 1 letter | digitized | |
| KBA 9375.236 | Fritz Barth an Karl Barth | 7th Dec 1910 | Item: 1 letter | digitized | |
| KBA 9375.237.2 | Fritz Barth an Karl Barth | 11th Dec 1910 | Item: 1 letter | digitized | |
| KBA 9375.237.1 | Anna Barth-Sartorius an Karl Barth | 11th Dec 1910 | Item: 1 letter | digitized |