History 7 Colonialism 3 Ethnic Groups 3 History, 19th Century 3 History, 20th Century 3 Medicine 3 Opium trade 3 Public Health 3 Public health 3 Social Environment 3 Social medicine 3 Cultural pluralism 2 English essays-- Literature 2 English fiction 2 Intercultural communication 2 Mass media in community development 2 Social change 2 Soldiers 2 Voyages and travels 2 history 2 19th Century 1 Afghanistan 1 Alcohol drinking 1 Alkaloids 1 China 1 Collected works 1 Congresses 1 Crime 1 Drinking of alcoholic beverages-Public Opinion 1 Drug abuse--Public Opinion 1