Portal:History of science/Selected anniversaries/April 28
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166:notable nations who have not ratified the treaty
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97:, Austrian mathematician (d. 1978)
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61:, Russian mathematician (d. 1908)
143:, French mathematician (b. 1870)
49:, French mathematician (b. 1834)
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156:Chemical Weapons Convention
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47:Sylvestre François Lacroix
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77:definition for the
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174:- Death of
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107:vaccine
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