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  1. 1
    Delineation of urban freeway gore area crash cushions /
    by Ullman, Gerald L.
    Published 1988
    Available online in Texas Transportation Institute online library
    Government Document Book
  2. 2
    Delineation of concrete safety-shaped barriers /
    by Ullman, Gerald L.
    Published 1988
    Government Document Book
  3. 3
    Retroreflective raised pavement marker field testing : initial interim report /
    by Ullman, Gerald L.
    Published 1992
    Book
  4. 4
    Retroreflective raised pavement marker field testing : results of the first year evaluation /
    by Ullman, Gerald L.
    Published 1994
    Book
  5. 5
    Retroreflective raised pavement markers : a two-year field evaluation in Texas /
    by Ullman, Gerald L.
    Published 1994
    Government Document Book
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