International Conference Series on Competition and Ownership in Land Passenger Transport (9th : 2005 : Lisbon, Portugal)
Amsterdam ; Oxford : Elsevier, 2007.
Conference on the Rehabilitation of Severely Damaged Land and Freshwater Ecosystems in Temperate Zones (1976 : Reykjavík, Iceland)
New York : Plenum Press, [1978]
International Symposium on the Recovery of Damaged Ecosystems (1975 : Virginia Polytechnic Institute and State University)
Charlottesville : University Press of Virginia, 1977.