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Book "Butterflies and other insects in quarries and gravel pits - What's buzzing and crawling in mineral extraction sites" (2016)
تحميل الإصدار (15.14 ميغابايت)
"Promotion of biodiversity at the mineral extraction sites of HeidelbergCement" - Guidance Document for Asia & Oceania (2010)
تحميل الإصدار (3.25 ميغابايت)