Funeral of prof. H. E. Armstrong
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Article
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2010
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Wiley (John Wiley & Sons)
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Ossipor-Schiiiidt, states tlint, ii speccinl group of workers is examining the possi1)ilit.y of n larger output of pyritic shale from tlic Donbii~, for consuniption in the sulphuric acid industry. It SCCIILS that some mines ;ire purposely under-cstimntiug t.hc production of this product ; t,hus the