Indicates outlets of sewers, mud-sewage flats, places of offensive trades, and districts affected by wind direction.
Oriented with north to the upper right.
Detached from Boston City documents, volume 3, number 68.
This date is inferred.
Exhibited: "More or less in common: environment and justice in the human landscape," organized by Leventhal Map & Education Center at the Boston Public Library, 2022.