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Letters and reprints, with covering letter from Charles Enz

Manuscript by Felix Villars of W. Pauli and F. Villars' paper: On the Invariant Regularization in Relativistic Quantum Theory, Rev. Mod. Phys. 21, 434-444. Equations relating to Schwinger's theory, with manuscript copy of a letter to Pauli, 29.12.1948. Equations and notes relating to the magnetic moment of electrons, and other matters, with manuscript copy of a letter to Pauli, 18.03.1949.

Includes: 'The mesotron from the theoretical point of view' W. Heitler [1948]; 'Wechselwirkungen zwischen Protonen, Neutronen und Elektronen. Folgerungen aus Experimentellen Daten und Wellenmechanischer Theorie' G. Wentzel [1948]; 'Les spectres beta et la theorie du neutrino' J. Solomon [1948]; 'Le Photon' L. de Broglie [1948]; 'Les moments magnetiques du proton et du neutron' F. Bloch [1948]; 'Astronomische Hinweise auf die Eigenschaften der Elementarteilchen' C. F. von Weizsäcker [1948]; 'Newtonsche und Einsteinsche Kosmologie' O. Heckmann and E. Schücking, Encyclopedia of Physics (Springer) 1958; 'Andere kosmologische Theorien' O. Heckmann and E. Schücking, Encyclopedia of Physics (Springer) 1958; 'Origin of the elements in stars' F. Hoyle 1958; 'On the evolution of galaxies' V. A. Ambartsumian [1958]; 'The arrow of time' T. Gold 1958; 'The steady state theory' F. Hoyle 1958; 'Weltmodelle' E Schücking and O. Heckmann [no date]; 'Some considerations regarding the earlier development of the system of galaxies' O. Klein [no date]; 'The primaeval atom hypothesis and the problem of the clusters of galaxies' G. Lemaitre [1958]; 'Radio-astronomical observations which may give information on the structure of the universe' A. C. B. Lovell [no date]; 'Distribution of galaxies and the density in the universe' J. H. Oort [no date]; 'Radio investigation of the galactic system and nearby galaxies; evidence of magnetic fields in galaxies' H. C. van de Hulst [1958]