The Pittsburgh Graded Tax Plan, Its History and Experience by Percy R. Williams, 1963

Subseries 1 includes a wide assortment of reports concerning city planning initiatives in Pittsburgh, particularly from the City Planning Department, the City Planning Commission, and other local agencies. The subseries includes the series of reports collectively known as the Pittsburgh Plan, the city’s first proposed comprehensive planning initiative, as well as 41 issues of a periodical called Progress (1921-1941), which promoted comprehensive urban planning.