01 جنوری 2018 Agricultural drainage, such as runoffs from farmlands and wineries, are contaminated waters. Their management is monitored by environmental protection authorities who set targets of volume or pollutant reductions. Due to large quantities and seasonal variations, the targets are often not met, and...
01 جنوری 1991 This book has every possible wetland species. For those of us with native ponds it gives wonderful information that I haven't found anywhere else. 297 pages, illustrated, photos