This collection (typeset in LaTeX) includes the papers that laid the foundations of spacetime physics:

H. A. Lorentz, Michelson's Interference Experiment

H. A. Lorentz, Electromagnetic Phenomena in a System Moving with any Velocity Smaller than that of Light

H. Poincaré, Sur la dynamique de l'électron (5 June 1905)

H. Poincaré, Sur la dynamique de l'électron (23 July 1905)

A. Einstein, On the Electrodynamics of Moving Bodies

1. Einstein, Does the Inertia of a Body Depend Upon its Energy Content?

H. Minkowski, The Fundamental Equations for Electromagnetic Processes in Moving Bodies

H. Minkowski, Space and Time

A. Einstein, On the Influence of Gravitation on the Propagation of Light

A. Einstein, The Foundation of the General Theory of Relativity

A. Einstein, Cosmological Considerations on the General Theory of Relativity

W. de Sitter, On the Curvature of Space

A. A. Friedmann, On the Curvature of Space

G. Lemaître, A Homogeneous Universe of Constant Mass and Increasing Radius Accounting for the Radial Velocity of Extra-Galactic Nebul