- An Introduction to Celestial Mechanics
by Forest Ray Moulton, 1914, PDF/DJVU/TXT - Celestial Mechanics
by J. B. Tatum, 2013, multiple PDFs, 8.3 MB - Celestial Mechanics: Notes
by J. D. Mireles James, 2007, PDF - Planetary Theory
by Ernest W. Brown & Clarence A. Shook, Cambridge University Press, 1933, 323 pages, PDF/DJVU/TXT - The Foundations of Celestial Mechanics
by George W. Collins II, 2004, 145 pages, PDF