Instruction provisoire sur la lutte contre les incendies provoqués par les bombardements aériens Instruction sur la défense aérienne passive de la population civile a.r.p. dept. circular Organisation of air raid general precautions / Home Office , Air raid precautions department a.r.p. dept. circular Air raid general precautions in rural areas Directions for the erection of domestic surface shelters / Home office , Air raid precautions department statutory rules and orders Air raid shelters for persons working in factories, mines and commercial buildings Pamphlet on garden trenches f.b. circular Emergency Fire Brigade Organisation - Information circular (March 1939) / Home office Certification mark for filtration plants giving protection against poison gases used in war / Home Office, Air raid precautions department circular Air riad precautions : provision of hospital accomodation verslag / kamer der volksvertegenwoordigers probleem der passieve bescherming tegen luchtaanvallen Air raid : the technique of silent approach, high explosive, panic / J. Langdon-Davies