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Note: Years in parentheses indicate when legislative authorization of each type of district occurred. The general pattern is one of rapid adoption of special districts following their authorization.
Source: Compiled from Oregon, Problems of the Urban Fringe, 2: 51–5.
Taylor, Zack, "Figure 7.4 Cumulative number of special districts in the tri-county area, by type, 1917-56.pdf" (2019). Shaping the Metropolis: Institutions and Urbanization in the United States and Canada by Zack Taylor. 25.