Author
5 free books by Niels Bohr, free to read online. Chapter 1 of any book is free, no account needed.
On the constitution of atoms and molecules
Niels Bohr
The Theory of Spectra and Atomic Constitution: Three Essays
The quantum postulate and the recent development of atomic theory
On the effect of electric and magnetic fields on spectral lines
On the quantum theory of radiation and the structure of the atom
