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Number of items: 2. Abell, George O. (1957) The distribution of rich clusters of galaxies. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-05022007-092134 Mathis, John Samuel (1956) The abundance of helium relative to hydrogen in the Orion Nebula. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-06072004-163340 |