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   <dim:field mdschema="dc" element="description" lang="en_US">Thesis. 1979. Ph.D.--Massachusetts Institute of Technology. Alfred P. Sloan School of Management.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">MICROFICHE COPY AVAILABLE IN ARCHIVES AND DEWEY.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">Bibliography: leaves 152-154.</dim:field>
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   <dim:field mdschema="dc" element="subject" qualifier="lcsh" lang="en_US">Production planning Mathematical models</dim:field>
   <dim:field mdschema="dc" element="title" lang="en_US">Hierarchical production planning.</dim:field>
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