The text image is derived from an excerpt in the 1942 book, "War Department's 'Technical Manual, Military Chemistry and Chemical Agents'". We're fortunate that Detroit junk shops are a treasure trove of once classified military ephemera. Book not included in purchase, but you do get a tie printed with with one of the best pages! Identification of Chemical Agents by odor - Mustard gas, Phosgene, CN solution. Be prepared for the apocalypse or econopocalypse, whichever comes first. Print ~15" up