Environmental aspects Environmental monitoring History, Modern Modern History Pollutants Primates as laboratory animals America—History America—Literatures Animal experimentation British and Irish Literature British literature Classical Studies Great Britain—History Handbooks, manuals, etc Hexachlorobenzene History History of Britain and Ireland History of Science History of the Americas Imperialism Imperialism and Colonialism Language and languages—Style Literary History Literature Literature, Modern—19th century Literature, general Literature    Literature—History and criticism Nineteenth-Century Literature North American Literature