Cumulative risk adjusted mortality chart for detecting changes in death rate: observational study of heart surgery

Objective: To detect changes in mortality after surgery, with allowance being made for variations in case mix.

Bill of mortality for ten years at Cambridge (manuscript chart), [1768]

One folded leaf containing a chart in John Winthrop's hand listing the number of deaths by month for 1759-1768 and listing the chief causes of mortality. The verso contains a list of the number of deaths by year according to age groups.

[ Portolan chart of eastern North and Central America and northern South America] : manuscript, 1659

Autograph (signed) map. Includes inscription: Made by Nicholas Comberford dwelling neare to the west end of the school house at the Sign of the Platt in Redcliffe. Anno 1659.