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== Articles ==
* ''Obs. of the corona during the eclipse. Aug. 7, 1869'', (1869).
* ''A nebula photometer'', (1876).
* ''Stellar magnitudes'', (1879), Astronomische Nachrichten, volume 95, p. 29.
* ''New planetary nebulae'', (1881), The Observatory, Vol. 4, p. 81-83.
* ''Photometric magnitude of Jupiter's satellite III'', (1881), The Observatory, Vol. 4, p. 113-114.
* ''Observations of the transit of Venus, December 5 and 6, 1882, made at the Harvard college observatory'' (1883).
* ''Photometric observations of Ceres, Pallas, and Vesta, at the Harvard College Observatory'', (1885), The Observatory, Vol. 8, p. 238-239.
== Referències ==
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