Description
Item Description:Description based on 1993; title from title screen (viewed on June 17, 2008).
Latest issue consulted: 1993.
Electronic resource.
Physical Description:volumes : digital, PDF file.
Publication Frequency:Annual
Format:Mode of access: Internet at the National Transportation Library web site. Address as of 6/17/08: http://ntl.bts.gov/lib/000/500/546/asc%5F93.pdf ; current access is available via PURL.