MINISTRY OF HOME SECURITY. AIR RAID PRECAUTIONS DEPARTMENT, Air Raid Precautions. Memorandum No.11: Gas Detection and Identification Service, London, HIS Majesty's Stationery Office, 1941 (2nd Edition), spill., pp ?, ill. in b./n. n.t., f.to 15,5x24,5. (ENG)
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