PickeringWilliam H., “A method of measuring the absolute sensitiveness of photographic dry plates”, Proceedings of the American Academy of Arts and Sciences, xx (1884), 159–62.
2.
PickeringWilliam H., “Photography of the infra-red region of the solar spectrum”, ibid., 473–7.
3.
CannonAnnie J., “William Henry Pickering 1858–1938”, Science, lxxxvii (1938), 179–181, p. 179–80.
4.
MartzE. P.Jr, “William Henry Pickering 1858–1938, An appreciation”, Popular astronomy, xlvi (1938), 299–310, p. 299.
5.
PickeringWilliam H., The Moon (New York, 1903), 56.
6.
Ibid..
7.
PickeringWilliam H., “A search for a planet beyond Neptune”, Annals of the Astronomical Observatory of Harvard College, lxi, pt 2 (1909), 113–62, p. 113.
8.
Pickering to ShapleyH., 26 June 1932, Harvard University Archives UAV 630.22.
9.
BrownErnest W., “On the predictions of trans-neptunian planets from the perturbations of Uranus”, Proceedings of the National Academy of Sciences, xvi (1930), 364–71.
10.
Pickering, op. cit. (ref. 7), 127.
11.
GravesWilliam Hoyt, “W. H. Pickering's planetary predictions and the discovery of Pluto”, Isis, lxix (1978), 551–64, p. 551.
12.
Ibid., 557.
13.
PickeringWilliam H., “The difference between the discoveries of Neptune and Pluto”, Publications of the Astronomical Society of the Pacific, xlvi (1934), 44–48, p. 48.
14.
NicholsonSeth B.MayallNicholas U., “Positions, orbit, and mass of Pluto”, Astrophysical journal, lxxii (1931), 1–12, p. 2.
15.
TombaughC. W., “The search for the ninth planet, Pluto”, Leafletno. 209 (1946) of the Astronomical Society of the Pacific.
16.
Hoyt, op. cit. (ref. 11), 562.
17.
Pickering to ShapleyH., 10 June 1922, Harvard University Archives UAV 630.22.
