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OECD International Trade
International Trade By Commodity Statistics (SITC Rev. 3)
2: Crude materials, inedible, except fuels
27: Crude fertilizers other than division 56, and crude minerals
272: Crude fertilizers (excluding those of division 56)
2723: Natural calcium phosph.; nat. alumin. calc. phosph.
27231: Natural calcium phosphates, unground
27231: Natural calcium phosphates, unground
27231: Natural calcium phosphates, unground
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