Newly digitized records — including a minister’s diary scanned and posted online by Boston’s Congregational Library and Archives — are shedding fresh light on devastating outbreaks of smallpox that hit the city in the 1700s.

Newly digitized records — including a minister’s diary scanned and posted online by Boston’s Congregational Library and Archives — are shedding fresh light on devastating outbreaks of smallpox that hit the city in the 1700s.