Quantum Theory of Line-Spectra, Part 1, Niels Henrik David Bohr 47167 [Full Title: On the Quantum Theory of Line-Spectra, Part 1, Niels Henrik David Bohr] [Link: http://www.gutenberg.org/4/7/1/6/47167 ] [Files: 47167-t.tex; 47167-pdf.pdf] Thanks to Andrew D. Hwang David