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hard blue stones for ballast sand maker

hard blue stones for ballast sand maker

Jan 01 2010 · The deposits that are extensively quarried for ballast is the Nairobi Phonolite Williams 1967 while the ones quarried for dimension stone is popularly known as the Nairobi Stone originally termed ‘Nairobi Claystone’ Sikes 1939 Williams 1967 Then there is also the physical need of human beings to be sheltered from the hostile attributes of the physical environment

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