Ordinary air contains about 21 per cent, oxygen and 78 per cent, nitrogen, the remaining one per cent, comprising argon, neon, helium, carbon dioxide, and other gaaea.
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Press, Volume LXV, Issue 19813, 28 December 1929, Page 6
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27Page 6 Advertisements Column 2 Press, Volume LXV, Issue 19813, 28 December 1929, Page 6
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