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London: H. M. Stationery Off., 1975
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London: H.M.S.O., 1987
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Aldershot [England]: Avebury, 1994
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Cheltenham [u.a.]: Elgar, 2008
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Paris: European Conference of Ministers of Transport, c 1999
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Aldershot, Hants [u.a.]: Gower, 1985
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Paris: European Conference of Ministers of Transport, 2004
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Dublin: Millikin and Sons, 1836 ; Farmington Hills, Mich: Thomson Gale
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Paris: International Transport Forum, 12 Oct 2018
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Paris: International Transport Forum, 12 Oct 2018
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Cheltenham; Northampton, Mass: Edward Elgar, 2008