Nineteen eighty-nine forest damage survey in Europe : executive summary
ImprintGeneva : UN, 21 June 1990.
"Adopted by the Programme Task Force of the International Co-operative Programme on Assessment and Monitoring of Air Pollution Effects on Forests, at its 6th meeting in Interlaken (Switzerland) from 15 to 17 May 1990". Issued in [E/]ECE/EB.AIR/26 (UN Sales no. 91.II.E.18).