Historical maps of the National Land Survey of Finland available georeferenced via Geoportti RI.

National Land Survey of Finland (NLS) has published their old map sheets as georeferenced images. The dataset reveals interesting phenomena, for example the transformation of the agrarian society to city-centered one. The dataset covers the time span from mid-1800 to the present. The dataset is openly available at Geoportti Research Infrastructure via Paituli Download service. More about the data in Finnish.