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   <dim:field mdschema="dc" element="contributor" qualifier="advisor" lang="en_US">Bernard T. Feld.</dim:field>
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   <dim:field mdschema="dc" element="date" qualifier="issued" lang="en_US">1956</dim:field>
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   <dim:field mdschema="dc" element="description" lang="en_US">Thesis (Ph.D.) Massachusetts Institute of Technology. Dept. of Physics, 1956.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Bibliography: leaves 30-31.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="statementofresponsibility" lang="en_US">by Burton Richter.</dim:field>
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