You wouldn't happen to know of any good books about chemical warfare during the First World War, would you?
Hmm, it’s not my specific area of research but there are a few books you should have a look at.
The Poisonous Cloud by Fritz Haber’s son Ludwig Haber which looks at the connections between German science, industry and the military and how gas warfare evolved on both sides of the wire.
Gas! Gas! Quick, Boys!: How Chemistry Changed the First World War by Michael Freemantle isn’t only about gas, but about chemistry in general during the war, but it does cover a lot about gas.
“GAS!” The Story of the Special Brigade by Charles Foulkes is the definitive British account. The Special Brigade was the Royal Engineers gas unit and Foulkes was a founding member.
Hope that helps.