Railway progress
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R.H.O.
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Article
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1940
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Elsevier Science
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English
โ 109 KB
disadvantage, but in making cosmetics and in pharmacy the propolis, in particular, is objectionable as it makes the wax much more acid, and mixtures which will be desirable in the pure wax may develop very differently because of the acid of the propolis. R. H. O. 9,500 Foot Peak Discovered in Pacifi