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- 81004730 contributor B3946401.
- 81004730 created "1980.".
- 81004730 date "1980".
- 81004730 date "1980.".
- 81004730 dateCopyrighted "1980.".
- 81004730 extent "iv, 49 p. :".
- 81004730 identifier "0309031176".
- 81004730 isPartOf "Transportation research record ; 773".
- 81004730 issued "1980".
- 81004730 issued "1980.".
- 81004730 language "eng".
- 81004730 publisher "Washington, D.C. : National Academy of Sciences,".
- 81004730 subject "380.5 s 625.7/94 19".
- 81004730 subject "Express highways.".
- 81004730 subject "Railroad crossings.".
- 81004730 subject "TE7 .H5 no. 773 TE228".
- 81004730 subject "Traffic signs and signals.".
- 81004730 subject "Visibility.".
- 81004730 title "Grade crossings, devices, visibility, and freeway operations / Transportation Research Board, Commission on Sociotechnical Systems, National Research Council.".
- 81004730 type "text".