books.google.com - Kenneth Lang's classic work Astrophysical Formulae. (Vol. I and II) is now available as soft cover edition in a set. This volume is a reference source of fundamental formulae in physics and astrophysics. In contrast to most of the usual compendia it carefully explains the physical assumptions entering...https://books.google.com/books/about/Astrophysical_Formulae.html?id=OvTjLcQ4MCQC&utm_source=gb-gplus-shareAstrophysical Formulae
