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Continue to ChatBertha (historical) Map - Multnomah County, OR https://www.yellowmaps.com/usgs/topo.cfm?map=or-1167032-bertha-%28historical%29
Bertha (historical) Map - Multnomah County, OR https://www.yellowmaps.com/usgs/topo.cfm?map=or-1167032-bertha-%28historical%29