Colonization (1) Wounds and injuries (1) Diseases (1) Case studies (1) Luges (1) City dwellers (1) Sleds (1) Upper class (1) Toboggans (1) State, The (1) Spleen (1) Russians (1) Proportion (1) Probabilities (1) Plausibility (Logic) (1) Impact (1) Epidemics (1) Elite (Social sciences) (1) Communicable diseases (1) Cities and towns (1) Cemeteries (1) Alcoholism (1) Tuberculosis (1) Syphilis (1) Evolution (1) Population (1) Trineos (1) Bazo (1) Sífilis (1) Morbilidad (1)