9781107692121 | Cambridge Univ Pr, December 6, 2012, cover price $29.99 | About this edition: Sir Arthur Stanley Eddington (1882-1944) was a key figure in the development of modern astrophysics, who also made important contributions to the philosophy of science and popular science writing.

9781107037373 | Cambridge Univ Pr, December 6, 2012, cover price $39.99

9780486458786 | Dover Pubns, April 19, 2007, cover price $23.95 | About this edition: Geared toward research students in physics and chemistry, this text introduces the three main uses of group theory in quantum mechanics: (1) to label energy levels and the corresponding eigenstates; (2) to discuss qualitatively the splitting of energy levels, starting from an approximate Hamiltonian and adding correction terms; and (3) to aid in the evaluation of matrix elements of all kinds.

9780486675855 | Reprint edition (Dover Pubns, June 1, 1993), cover price $16.95 | About this edition: Geared toward research students in physics and chemistry, this text introduces the three main uses of group theory in quantum mechanics: (1) to label energy levels and the corresponding eigenstates; (2) to discuss qualitatively the splitting of energy levels, starting from an approximate Hamiltonian and adding correction terms; and (3) to aid in the evaluation of matrix elements of all kinds.