New method of road building
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C.
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Article
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1880
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Elsevier Science
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English
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Peckeliih and Washington, obtaining for the epoch of ininimum 1878"9. The variations in m~tgnetic declination at Milan, Vienna, Prague, Munich and Christiania indic tte the minimum epoch ]878"5. Both results agree in pointing to an epoch of 11"7 years.~Compt. Read. C.