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2
-
Relativity-A Richer Truth / by Philipp Frank; with a Foreword by Albert Einstein.
- 530.11
- Frank, Philipp, 1884-1966.
- Jonathan Cape,
- 1951.
- London :
-
Naturaleza, historia, Dios / Xavier Zubiri.
- 113 Z93 1951
- Zubiri, Xavier.
- [Uguina],
- 1951.
- Madrid :