Creator
- Clackamas County (Or.)[remove]6
- Oregon State College. Extension Service5
- Long Range Planning Conference (1925 : Clackamas County, Or.)1
- Long Range Planning Conference (1936 : Clackamas County, Or.)1
- Long Range Planning Conference (1946 : Clackamas County, Or.)1
- Long Range Planning Conference (1948 : Clackamas County, Or.)1
- Long Range Planning Conference (1956 : Clackamas County, Or.)1
- Long Range Planning Conference (1969 : Clackamas County, Or.)1
- Oregon State University. Extension Service1