Akershus amt nr 57-2: Kart over Kristiania Omegn
| Map series: | Amtskartsamling |
|---|---|
| Region: | Akershus |
| Year: | 1885 |
| Scale: | 1:25000 |
| Techniques: | Heliogravyre |
| Cartographers: | Johannes Solem, Johan Nordhagen |
| Publishers: | Revideret i Marken 1890; 1891 og 1892. |