Eleanor Burke Leacock
National Rail-Highway Crossing Safety Conference (1980 Transportation Center, University of Tennessee, Knoxville)
United States. National Transportation Safety Board.
William J. Hedley
New York (N.Y.). Office of the City Construction Co-ordinator
Unknown Author
United States. General Accounting Office
Philadelphia. Dept. of Public Works.
Montana. Highway Planning Survey
David W. Schoppert
Georg Nitze
Walter F. Rench
Neilon J. Rowan
Virginia. Dept. of Transportation.
Montana. State Highway Commission. Planning Survey Section.
Board of Transport Commissioners for Canada.
United States. Joint Action Group on Grade Crossing Safety.
Great Britain. Ministry of Transport and Civil Aviation.
South Africa. Level crossings commission.
Le Roy T. Harkness