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Footnote 49:
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Footnote 50:
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Footnote 51:
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1903 (abstract in _Trans. Inst. M.E._, 1903, =27=, p. 660).
Footnote 52:
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Footnote 53:
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Footnote 54:
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407.
Footnote 55:
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Footnote 56:
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Footnote 57:
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Footnote 58:
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Footnote 59:
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by F. H. Hatch).
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Footnote 61:
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Footnote 62:
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Okawa).
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Footnote 64:
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Footnote 65:
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Footnote 66:
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Footnote 67:
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Footnote 68:
Martin, Johnson and Grant: _U.S. Geol. Surv., 1917_, _Bull._ No. 587,
p. 238.
Footnote 69:
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Sci. Press_, Oct. 11, 1919.
Footnote 70:
_Board of Trade Journ._, Dec. 11, 1919, =103=.
Footnote 71:
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Footnote 72:
Hall, F. A.: _Eng. and Min. Journ._, Oct. 10, 1914, p. 642.
Footnote 73:
Knopf, A.: _Min. and Sci. Press_, June 5, 1915, p. 878.
Footnote 74:
_Chem. and Met. Eng._, March 24, 1920.
Footnote 75:
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Footnote 76:
_Eng. and Min. Journ._, May 25, 1905, p. 985.
Footnote 77:
Taft, H. H.: _Eng. and Min. Journ._, 1918, =106=, No. 21, p. 900.
Footnote 78:
Hussak, Euginio: “O Palladio e a Platina no Brasil,” _Annas da Escola
de Minas de Ouro Preto_, 1916, No. 8, 85–188.
Footnote 79:
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No. 11.
Footnote 80:
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1908.
Footnote 81:
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Distribution_, London, 1908, p. 25.
Footnote 82:
_Journ. of the Royal Society of Arts_, 1908, =56=, p. 884.
Footnote 83:
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