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  1. 420 yrs of smallpox epidemics in Mexico City: Impact of charity, quarantine, inoculation and vaccination webcache.googleusercontent.com/search?q=cache:VIjOjeoVs8kJ:www.hist.umn.edu/~rmccaa/mexico/poxcity.doc+&cd=2&hl=en&ct=clnk&gl=us
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