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Wm. Harkness
Wm. Harkness
Washington Observations for 1870. Appendix II. Reports on Observations of Encke's Comet during Its Return in 1871
Asaph Hall, B. F. Sands, Wm. Harkness
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On the Progress of Science as Exemplified in the Art of Weighing and Measuring: Being the Presidential address delivered before the Washington Philosophical Society, december 10, 1887, pp. XL-LXXXVI
Wm. Harkness
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