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   <dim:field mdschema="dc" element="contributor" qualifier="advisor" lang="en_US">Robert W. Simpson.</dim:field>
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   <dim:field mdschema="dc" element="description" lang="en_US">Thesis. 1978. M.S.--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics.</dim:field>
   <dim:field mdschema="dc" element="description" lang="en_US">MICROFICHE COPY AVAILABLE IN ARCHIVES AND AERONAUTICS.</dim:field>
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   <dim:field mdschema="dc" element="title" lang="en_US">A multi-equation demand model for air transportation services.</dim:field>
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