Search Constraints
Filtering by:
Subject
Potatoes -- Oregon -- Willamette River Valley -- Fertilizers
Remove constraint Subject: Potatoes -- Oregon -- Willamette River Valley -- Fertilizers
Decade
1930-1939
Remove constraint Decade: 1930-1939
Subject
Soils -- Oregon -- Willamette River Valley
Remove constraint Subject: Soils -- Oregon -- Willamette River Valley