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Parris, C.; Shock, C.C.; Feibert, E.; Shaw, N. 2010. Native plant seed production – Sulphur-flower buckwheat (Eriogonum umbellatum). Sustainable agricultural techniques. Corvallis, OR: Oregon State University, Malheur Agricultural Experiment Station. Fact Sheet. 3 p.
Shock, C.C.; Feibert, E.B.G.; Saunders, L.D.; Shaw, N.L. 2009. Native wildflower seed production with limited subsurface drip irrigation. Corvallis, OR: Oregon State University, Malheur Experiment Station. Special Report 1094: 157-176.
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Shock, C.; Feibert, E.; Saunders, L.; Shaw, N. 2013. Irrigation requirements of annual native wildflower species for seed production, fall 2012 planting. Corvallis, OR: Oregon State University, Malheur Experiment Station. Ext/CrS 149: 193-197.
Shock, C.; Feibert, E.; Saunders, L.; Shaw, N.; Sampangi, R. 2012. Irrigation requirements for native wildflower seed production. Corvallis, OR: Oregon State University, Malheur Experiment Station. Annual Report 2011 Ext/CrS: 139-160.
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