Akershus amt nr 57-4: Kart over Kristiania Omegn
| Map series: | Amtskartsamling |
|---|---|
| Region: | Akershus, Oslo |
| Year: | 1881 |
| Scale: | 1:25000 |
| Techniques: | Heliogravyre |
| Cartographers: | Johannes Solem, Nordmann |
| Publishers: | Revideret i Marken 1890; 1891 og 1892. |