Home › Authors › Olavi Heikkinen 👤 Olavi Heikkinen 3 books Books by Olavi Heikkinen Environmental aspects of the t Environmental aspects of the timberline in Finland and in the Polish Carpathians 1995 Suomalaiset Aasian-kävijät Suomalaiset Aasian-kävijät 1980 A trend-surface analysis of re A trend-surface analysis of relief in Sippo, southern Finland 1975