Transpo '69 : the transportation environment: papers presented at the third symposium of the Society of Environmental Engineers to mark its tenth anniversary, Imperial College of Science and Technology, April 15, 16, 17 and 18, 1969.
Society of Environmental Engineers.Symposium(3rd :1969 :Imperial College)
13 Homewell, Havant (Hants) :  Society of Environmental Engineers, 
1969.