Ghazaryan, H. English for Ecologists : Academic manual / H. Ghazaryan, S. Khachaturyan ; Ministry of Education and Science. State Engineering University of Armenia (Polytechnic). - Yerevan : Chartaraget, 2009. - 140 pages ; 20 cm. - 42-8(075.8) (NLA) . ISBN: 978993954044 Subjects--Topical Terms: English language--Handbooks Universal Decimal Class. No.: 42-8(075.8) (NLA)