...exhaustive survey and evaluation of facilities; history of the system since 1950; population of wards 1925-2020; number of workers in downtown Boston; water quality classification for the harbor; statistics on water use, sewage flow, etc. for various downtown buildings; the 1975 supplement (revised in 1976) updates portions of the 1967 main report and a 1972 report; copies of these items were in the BRA collection...