Lately I have found myself in a number of terrific archives in Philadelphia, from the Library Company to the Historical Society. This image comes from an annual 1913 public health report from Philadelphia which Dona Horowitz-Behren, the city’s historian, unearthed for me. The objective? To illustrate the number of deaths from 15 diseases over the previous decade, and the increase and decrease of each cause. This beautiful chart folds out of a perfectly ordinary printed book. Isn’t it inspiring to think of all of the things like these waiting to be discovered?