Creator
- Washington County (Or.)5
- Oregon State College. Extension Service3
- Oregon State University. Extension Service2
- Long Range Planning Conference (1925 : Washington County, Or.)1
- Long Range Planning Conference (1936 : Washington County, Or.)1
- Long Range Planning Conference (1946 : Washington County, Or.)1
- Long Range Planning Conference (1957 : Washington County, Or.)1
- Long Range Planning Conference (1968 : Washington County, Or.)1