RT null T1 Trainers workbook on cleaner production in leather tanning A1 United Nations Environment Programme, PB United Nations Environment Programme SN 9280716069 YR 1996 FD 1996 LK https://wedocs.unep.org/handle/20.500.11822/8197 UL https://wedocs.unep.org/handle/20.500.11822/8197 NO Trainers Workbook on Cleaner Production in Leather Tanning. DS UN Environment Document Repository RD Sep 22, 2026