Fast, efficient identification of and access to
transportation literature is increasingly important.
Infrastructure concerns and the
Transportation Efficiency Act (TEA 21) all
place additional demands on collecting information
that has been called ``fragmented,
dispersed and difficult to acquire'' (Bravo et al.,
1994) at an AASHTO meeting in 1994. The
importance of this information is supported by
the statistic that transportation accounts for
11.1 percent of the US Gross Domestic
Product (Bureau of Transportation Statistics,
1998).