00000nam 2200000zi 4500 9.896376 CaOODSP 20221107174311 m o d f cr cn||||||||| 201008s1990 snca o f000 0 eng d CaOODSP eng rda CaOODSP eng fre n-cn--- En37-339/1990-PDF A river under siege = Une rivière assiégée. Rivière assiégée Regina, Saskatchewan : Environment Canada, Inland Waters Directorate, Western and Northern Region = Environnement Canada, Direction générale des eaux intérieures, Région de l'Ouest et du Nord, 1990. 1 online resource (2 unnumbered pages) : illustrations text txt rdacontent computer c rdamedia online resource cr rdacarrier Caption title. Digitized edition from print [produced by Environment and Climate Change Canada]. "Most rivers start high in the mountains. Rains, snowmelt, glacier melt and groundwater join to form the beginnings of the river. Even at this early stage, isolated in the high reaches of the mountains, the river can be contaminated. Rain and snow can pick up airborne pollutants from cities and factories and deposit them over the mountains in the form of acid rain or chemical pollution"--Page [2]. Text in English and French. Stream ecology Canada. Water Pollution Canada. Canada. Inland Waters Directorate. Western and Northern Region, issuing body. A river under siege = fre (CaOODSP)9.903175 PDF 3.59 MB https://publications.gc.ca/collections/collection_2021/eccc/en37/En37-339-1990.pdf