Archive image from page 6 of Development and activities of roots. Development and activities of roots of crop plants; a study in crop ecology . developmentactiv00weav Year: 1922 DEVELOPMENT AND ACTIVITIES OF ROOTS OF CROP PLANTS A STUDY IN CROP ECOLOGY BY John E. Weaver, Frank C. Jean, and John W. Crist Published by the Cahnegie Institution of Washington Washington, May, 1922 Monograph

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