On the internal structure of the earth considered as affecting the phenomena of precession and nutation, supplementary to article under the above head, Smithsonian contributions to knowledge, vol. XIX, no. 240 being the third of the problems of rotary motion. - Barnard, J. G. (John Gross), 1815-1882. ([Washington, Smithsonian Institution, 1877)
Keywords: Astronomy; Earth (Planet) -- Internal structure; Precession; Nutation