HOME OFFICE. AIR RAID PRECAUTIONS DEPARTMENT, Air Raid Precautions. Memorandum No.C7: Air Raid Precautions for Canals, Navigable Rivers, Land Drainage Channels and Tidal Embankments, London, His Majesty's Stationery Office, 1938 (1st Edition), spill., pp ?, ill. in b./n. n.t., f.to ?. (ENG)
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