Edgar Z. Friedenberg

Youth and History: Tradition and Change in European Age Relations, 1700-Present.

A phosphate optical glass, whose length of the light path is substantially independent of temperature, comprising, in % by weight, }P2O5 27 - 55 }K2O 6 - 26 }BaO 10 - 50 }K2O + BaO larger than 35 }Al2O3 2 - 15 }TiO2 + Nb2O5 + Ta2O5 4 - 20 }TiO2 0 - 14 }Nb2O5 0 - 20 }Ta2O5 0 - 7 }B2O3 0 - 5 }Li2O 0 - 2 }Na2O 0 - 5 }MgO 0 - 6 }CaO 0 - 8 }SrO 0 - 10 }ZnO 0 - 10 }PbO 0 - 13, and }As2O3 0 - 2 . }

The disposal of liberty and other industrial wastes

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