Soils of willamette series and their utilization
Powers, W.L., Ruzek, C.V., Stephenson, R.E.
Soils of willamette series and their utilization - Corvallis 1928 - 1-28 p. - Soils, Utilization Oregon Agricultural Experiment Station. Station Bulletin No. 240 .
Soils of willamette series and their utilization - Corvallis 1928 - 1-28 p. - Soils, Utilization Oregon Agricultural Experiment Station. Station Bulletin No. 240 .