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	1971 - 1993
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Reports from the London Research Station of British Gas Corporation Reports from Scottish Gas, 1971, 1985 - 90 Reports by South Eastern Gas, 1968, 1982 - 92 Reports by British Gas Southern, 1986, 1993 Reports on van stocks by British Gas Northern Reports by North Western Gas Board (later British Gas North Western), 1971, 1993 Reports by West Midlands Gas (later British Gas West Midlands), 1974, 1994 Report by British Gas Wales/Cymru