Columbia subject headings:
City planning--Oregon--Willamette River Region--History--20th century.
City planning--Oregon--Willamette River Region--History--21st century.
Water resources development--Planning--Oregon--Willamette River Region.
Harvard subject headings:
City planning--Oregon--Willamette River Region--History--20th century.
City planning--Oregon--Willamette River Region--History--21st century.
Water resources development--Oregon--Willamette River Region--Planning.
Princeton subject headings:
City planning--Oregon--Willamette River Region--History--20th century.
City planning--Oregon--Willamette River Region--History--21st century.
Water resources development--Planning--Oregon--Willamette River Region.