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English-Bulgarian polytechnical dictionary . 2013.
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Parchment — For other uses, see Parchment (disambiguation). Central European (Northern) type of finished parchment made of goatskin stretched on a wooden frame Parchment is a thin material made from calfskin, sheepskin or goatskin, often split. Its most… … Wikipedia
Fertilizer — Tennessee Valley Authority: Results of Fertilizer demonstration 1942 … Wikipedia