00506nam a2200181Ia 4500 21868 21868 21566 PK-LaUMT 20221004172546.0 140409s9999 xx 000 0 und d PK-LaUMT W 668.4239 TEC- UNEP Technoology progress on protecting the ozone layer: flexible and rigid foams technical options report UNEP New York,USA: United Nations, 1989 85 p. EN WEEDED OUT ddc 0 0 0 0 01 01 2014-04-09 0 W 668.4239 TEC- 4835 2014-04-23 00:00:00 2014-04-23 BK