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![[Operations Letter No. 128, Office of Civilian Defense, Washington, D.C., May 15, 1943]](https://digitalcollections.museumofflight.org/files/square_thumbnails/172576f40bc614012d17955f7cbf10f6.jpg "[Operations Letter No. 128, Office of Civilian Defense, Washington, D.C., May 15, 1943]")
Operations Letter No. 128, Office of Civilian Defense, Washington, D.C., May 15, 1943. Provides information about how to protect against war gas.