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2Published 1977Subjects: “...Engineers United States Biography....”
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3Published 1970Subjects: “...Highway engineers United States Directories....”
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6Published 1922Subjects: “...Engineers United States Directories....”
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12Published 1985Subjects: “...Engineers United States Directories....”
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17Published 1984Subjects: “...Automobile engineers United States Directories....”
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20Published 1997Subjects: “...Engineers United States Directories....”
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