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Number of items: 2. 1957Abell, George Ogden (1957) The Distribution of Rich Clusters of Galaxies. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/99X5-ZM38. https://resolver.caltech.edu/CaltechETD:etd-05022007-092134 1956Mathis, John Samuel (1956) The Abundance of Helium Relative to Hydrogen in the Orion Nebula. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/CB4D-4026. https://resolver.caltech.edu/CaltechETD:etd-06072004-163340 |