treatment of mustard gas burns UK Ministry of Defence Report on disposal of weapons at sea and incidents arising Rhydymwyn Valley History Society The advent of mustard gas in 1917, Simon Jones Measures to protect against mustard gas, 1917-1918, Simon Jones Thioethers Organochlorides Blister agents World War I chemical weapons IARC Group 1 carcinogens Chloroethyl compounds Sulfur mustards