Nicholas Rosen, "General Relativity and Flat Space I" and "General Relativity and Flat Space II" and "Note on Ether-Drift Experiments", the three papers in the Physical Review, volume 57, number 2, January 15, 1940, occupying pp 147-155 in the issue of pp 75-162. Original wrappers. Solid, fresh, Very Good copy. $200
- Also in this issue J.R. Oppenheimer, H. Snyder and R. Serber, "Production of Soft Secondaries by Mesotrons".
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