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- catalog contributor b1502320.
- catalog created "1980.".
- catalog date "1980".
- catalog date "1980.".
- catalog dateCopyrighted "1980.".
- catalog description "Includes bibliographical references.".
- catalog extent "iv, 49 p. :".
- catalog identifier "0309031176".
- catalog isPartOf "Transportation research record ; 773".
- catalog issued "1980".
- catalog issued "1980.".
- catalog language "eng".
- catalog publisher "Washington : National Academy of Sciences,".
- catalog subject "Express highways.".
- catalog subject "Railroads Crossings.".
- catalog subject "Traffic signs and signals.".
- catalog subject "Visibility.".
- catalog title "Grade crossings, devices, visibility, and freeway operations / Transportation Research Board, Commission on Sociotechnical Systems, National Research Council.".
- catalog type "text".