A simple map of the Salpausselkä ridge system and other end-morain ridges in Finland
cartographical base - w:OpenStreetMap, Geomorphological plan of Salpausselka - Glückert, G. The First Salpausselkä at Lohja, southern Finland // Bulletin of the Geological Society of Finland. — 1986. — P. 45-55.
Вячеслав Митрофанов