Woodcuts - four monochromatic landscapes

Four prints of landscape woodcuts by the same author. All the woodcuts are
monochromatic, often lightly underpainted by hand with watercolors. The signature is not yet
read. All the prints are from the 1950s, but the artist made them using traditional techniques, so the craftsmanship is exactly the same as it once was.
The format of the woodcuts is 13.5 cm x 9.8 cm, the size of the whole is 18 cm x 24 cm.