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Чикаго-гийн эшлэл (17 дахь хэвлэлт)ebrary, Inc. Dawn of the Replacement Era: Reinvesting in Drinking Water Infrastructure. Denver, Colo.: American Water Works Association, 2008.
MLA -ийн эшлэл (9 дэх хэвлэлт)ebrary, Inc. Dawn of the Replacement Era: Reinvesting in Drinking Water Infrastructure. American Water Works Association, 2008.
Анхааруулга: Эдгээр ишлэлүүд үргэлж 100% үнэн зөв биш байж магадгүй.