| RefNo | Title | Source |
| DF/TM/1/36/4 | Correspondence K: Koenig | |
| DF/TR/1/1/24/250 | Koenig, A | |
| DF/TR/1/1/29/367 | Koenig, [Alexander] | |
| DF/TM/1/50/22 | Correspondence K: Koch; Kohler; Koenig | |
| DF/TM/1/14/7 | Correspondence K: Koch; Koenig; Kolbe; Kolm | |
| DF/TR/1/1/33/289 | Koenig, [Alexander] | |
| DF/TR/1/1/34/284 | Koenig, [Alexander] | |
| DF/TM/1/8/7 | Correspondence K: Koenig; Koepert; Kolbe | |
| DF/TR/1/1/28/336 | Koenig, [Alexander] | |
| DF/TM/1/28/15 | Correspondence K: King & Co; Kingham; Koch; Koenig; Koonz | |
| DF/TR/1/1/31/333 | Koenig, A | |
| DF/TM/1/3/6 | Correspondence K: Koenig; Kraatz; Krohn | |
| DF/TM/1/57/6 | Correspondence K: Kobayashi; Kobelt; Koenig; Kohler | |
| DF/TR/1/1/25/262 | Koenig, A | |
| DF/TR/1/1/30/298 | Koenig, Alexander | |
| DF/TM/1/64/16 | Correspondence K: Koenig; Kollibay; Kollmorgen | |
| DF/TR/1/1/32/278 | Koenig, [Alexander] | |
| DF/TM/1/21/11 | Correspondence K: Kirchner; Knudsen; Koch; Koenig; Korte; Kraatz; Kraepelin; Kricheldorff | |
| DF/TM/1/44/4 | Correspondence K: Knight; Koenig; Koepert | |
| DF/TR/1/1/26/303 | Koenig, [Alexander] | |