 Numbers, Forbidden and Superstitious: An entry from Macmillan Reference USA's <i>Macmillan Reference USA Science Library: Mathematics</i> by Harry J. Kuhman, 2002
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 How a Second Grader Beats Wall Street: Golden Rules Any Investor Can Learn by Allan S. Roth, 20090309
 Palynology and organiccarbon isotope ratios across a terrestrial Palaeocene/Eocene boundary section in the Williston Basin, North Dakota, USA [An article ... Palaeoclimatology, Palaeoecology] by G.J. Harrington, E.R. Clechenko, et all
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 On Cutting Off a Ratio by of Perga Apollonius, 198706
 On cutting off a ratio: An attempt to recover the original argumentation through a critical translation of the two extant medieval Arabic manuscripts by Apollonius, 1988

