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Fry, J.F., 1970. TOWN GAS EXPLOSIONS IN DWELLINGS. Fire Research Notes 813
An examination has been made of fire brigade reports of incidents involving explosions of town gas in dwellings during the 12 years 1957 - 68. The average annual, frequency was about 84 but appears to be increasing. The average rate of incidence is about 5.0 per 10^8 therms of gas sold. About 48 per cent of incidents cause some structural damage and in 38 per cent of these it is considered "severe".