Suv resurslaridan mukammal foydalanish va muhofaza qilish

• Author: X.I. VALIYEV, SH.O. MURADOV, B.M. XOLBAYEV
• Language: O'zbek tilida
• Writing: Lotin yozuvida
• Publisher: Fan va texnologiya
• Year: 2010
• Views: 226

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