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Spectroscopic apparatus used by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff, c1895 Unknown
Gustav Robert Kirchhoff, German physicist, 1876 Unknown
Gustav Robert Kirchhoff, German physicist, 1873 Unknown
Spectroscopic apparatus used by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff, c1895 Unknown
Gustav Kirchhoff, Robert Bunsen and Henry Roscoe, scientists, c1860 Unknown
Round Cut Rubies Anonymous

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