2nd Trabzon International Energy and Environment Symposium, Trabzon, Türkiye, 26 - 29 Temmuz 1998, ss.327-330
According to this study related to Macka and other Turkish State Forests, the state forests have been decreasing day by day. This is because of the fact that the amount of raw wood material taken out from the forests has been more than the production potential of the forests. That study concluded that the Macka and other Turkish forests will be exhausted after 64 and 67 years respectively.