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In: University of Cambridge, Institute of Astronomy, http://www.ast.cam.ac.uk/about/history/biographies.e.-.l
as on 2017-1-26.
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Long, A.W. The foundation and development of the Astronomical Society of South Africa. Journal of the Astronomical Society of South Africa, 1930, Vol. 2(4), pp. 153-180.
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South African Association for the Advancement of Science. Report, 1903, 1905/6, 1910: Lists of members.