planets

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On the constitution of the planetary system; and on the theory and tables of Mars, (in a letter addressed to Marshall Vaillant)
M. U. J. LeVerrier

American Journal of Science September 1861, s2-32 (95) 222-227; DOI: https://doi.org/10.2475/ajs.s2-32.95.222
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On the nebular hypothesis
Daniel Kirkwood

American Journal of Science September 1860, s2-30 (89) 161-181; DOI: https://doi.org/10.2475/ajs.s2-30.89.161

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