The interpretation of crude oil analyses. (Bureau of mines hempel method) von Smith, N.A.C.

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Fourth semi-annual motor gasoline survey von Smith, N.A.C.

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Third semi-annual motor gasoline survey von Smith, N.A.C.

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Motor gasoline survey von Smith, N.A.C.

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Horticultural research in the National Botanical Institute of South Africa: past achievements and future directions von Smith, G.F., Brown, N.A.C., Botha, D.J., Rutherford, M.C., Donaldson, J.S., De Lange, J.H.&Davis, G.W.

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Toxic gases from high-sulphur petroleum von Sayers, R.R., Smith, N.A.C.

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