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   <dim:field mdschema="dc" element="contributor" qualifier="advisor" lang="en_US">L. H. Ahrens.</dim:field>
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   <dim:field mdschema="dc" element="contributor" qualifier="department" lang="en_US">Massachusetts Institute of Technology. Department of Geology</dim:field>
   <dim:field mdschema="dc" element="contributor" qualifier="department">Massachusetts Institute of Technology. Department of Earth, Atmospheric, and Planetary Sciences</dim:field>
   <dim:field mdschema="dc" element="date" qualifier="accessioned">2010-10-29T17:55:37Z</dim:field>
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   <dim:field mdschema="dc" element="date" qualifier="issued" lang="en_US">1952</dim:field>
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   <dim:field mdschema="dc" element="description" lang="en_US">Thesis. (Ph.D.) Massachusetts Institute of Technology. Dept. of Geology, 1952.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Vita.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Bibliography: leaves 159-164.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="statementofresponsibility" lang="en_US">by Walter Holyk.</dim:field>
   <dim:field mdschema="dc" element="description" qualifier="degree" lang="en_US">Ph.D.</dim:field>
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   <dim:field mdschema="dc" element="title" lang="en_US">Some geological aspects of radioactivity: The use of biotite in determination of geologic age by the strontium method. The use of lepidolite in determination of geologic age by the calcium method. The potassium content of ultramafic rocks and its heat contribution</dim:field>
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   	&lt;Title>Some geological aspects of radioactivity: The use of biotite in determination of geologic age by the strontium method. The use of lepidolite in determination of geologic age by the calcium method. The potassium content of ultramafic rocks and its heat contribution&lt;/Title>
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