Browsing Extension Service -- Circulars / Extension Circulars by Author "Jackson, T. L."

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How to take a soil sample...and why

Oregon State University. Cooperative Extension Service; Jackson, T. L.; King, Arthur S.; Gardner, E. Hugh (Corvallis, Or. : Cooperative Extension Service, Oregon State University, 1970-10)
How to take a soil sample...and why

Oregon State College. Federal Cooperative Extension Service; King, Arthur; Jackson, T. L. (Corvallis, Or. : Federal Cooperative Extension Service, Oregon State College, 1957-04)