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18001
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18002
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18003
Urban research, 1960 presented at the 39th annual meeting, January 11-15, 1960.
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18004
Highway research in the United States needs, expenditures, and applications, 1959.
Cyhoeddwyd 1960Llyfr -
18005
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18006
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18007
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18008
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18009
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18010