1
by G.F.S.
Published in Journal of the Franklin Institute (1932)
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2
by G.F.S.
Published in Journal of the Franklin Institute (1932)
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3
by G.F.S.
Published in Journal of the Franklin Institute (1932)
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4
5
by G.F.S.
Published in Journal of the Franklin Institute (1931)
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6
by G.F.S.
Published in Journal of the Franklin Institute (1931)
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7
by G.F.S.
Published in Journal of the Franklin Institute (1931)
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8
9
by G.F.S.
Published in Journal of the Franklin Institute (1931)
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10
by G.F.S.
Published in Journal of the Franklin Institute (1931)
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