Otchet o nauchnojj sesii posvjashhennojj 150-letiju "Syl'vana" organizovannojj v ramakh 70 s''ezda PLO v Varshave v dnju 26 sentjabrja 1970 goda
EN
Report on the scientific session devoted to 50th anniversary of "Sylwan", organized during the 70th Congress of the Polish Forest Society in Warsaw on 26th September, 1970