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plastics are derived from organic products. the materials used in the production of plastics are natural products such as cellulose, coal, natural gas, salt and, of
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longwall mining overview. in the coal can be extracted along the full length of the face in slices of a given width , production and hence income is zero
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report of investigations 8507 structure response and damage produced by ground vibration from surface mine blasting by d. e. siskind, m. s. stagg, j. w. kopp,
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