History 13 Films for hard of hearing people 11 Antiquities 5 Architecture, Ancient 3 Holocaust, Jewish (1939-1945) 3 Structural engineering 3 World health 3 Communicable diseases 2 Documentary films 2 Epidemics 2 Evolution (Biology) 2 Global warming 2 Jews 2 Public health 2 Race relations 2 Social conditions 2 Vietnam War, 1961-1975 2 AIDS (Disease) 1 African American teenage boys 1 African Americans 1 Animal intelligence 1 Animals as carriers of disease 1 Ants 1 Apes 1 Architecture 1 Armed Forces 1 Avian influenza 1 Behavior 1 Biological control 1 Biologists 1