Second Bangor Symposium on Communications, 23 - 24 May 1990
6. Fachkolloquium Strasse und Verkehr : Stuttgart 1999
"Land use, lifestyle and transport" : documentation
2003 program - EGCR, 31st Annual Eastern Gas Compression Roundtable
2002 program - EGCR, 30th Annual Eastern Gas Compression Roundtable