Search for: Title Author Subject Series that begins with: 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings > Browse Headings # Chemical warfare 6 SEE ALSO narrower term: Gases, Asphyxiating and poisonous -- War use 1 SEE ALSO narrower term: Herbicides -- War use 1 Chemical warfare -- Europe. 1 Chemical warfare -- History. 1 Chemical warfare -- Juvenile literature. 7 Chemical warfare -- Research -- United States -- History -- 20th century. 1 Chemical warfare -- Safety measures -- Juvenile literature. 1 Chemical warfare -- United States -- History -- 20th century. 1 Chemical weapons 3 Chemical weapons disposal -- Syria. 1 Chemical weapons -- Fiction. 10 10 20 30 50 100 per page < Previous 10 Headings Next 10 Headings >