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- 77023052 contributor B3041808.
- 77023052 created "1976.".
- 77023052 date "1976".
- 77023052 date "1976.".
- 77023052 dateCopyrighted "1976.".
- 77023052 description "Includes bibliographical references.".
- 77023052 extent "iii, 68 p. :".
- 77023052 identifier "0309025877 :".
- 77023052 isPartOf "Transportation research record ; 611".
- 77023052 issued "1976".
- 77023052 issued "1976.".
- 77023052 language "eng".
- 77023052 publisher "Washington : National Academy of Sciences,".
- 77023052 subject "380.5/08 s 625.1/63".
- 77023052 subject "Railroad crossings.".
- 77023052 subject "TE7 .H5 no. 611 TE228".
- 77023052 subject "Traffic signs and signals.".
- 77023052 title "Railroad-highway crossings, visibility, and human factors / Transportation Research Board, Commission on Sociotechnical Systems, National Research Council.".
- 77023052 type "text".