1995h-186 2012f-288 2015f-766 20thcentury asianamericans australia blackdeath california crises diseaseoutbreaks environmentalaspects environmentalconditions epidemics epidemiology histoire history humanecology medicine medieval médecinemédiévale mittelalter pandemics pandemie pest peste pestenoire plague prejudice sanfrancisco socialaspects socialchange socialconditions socioeconomicfactors sources sweden to1500