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Cover of Herbicides and plant growth regulators by william whigham fletcher,e. e. fletcher,r. c. kirkwood

Herbicides and plant growth regulators

By William Whigham Fletcher,E. E. Fletcher,R. C. Kirkwood

Growth regulators for garden, field and orchard

Growth regulators for garden, field and orchard

By Mitchell, John W.

Cover of Plant growth regulators by roberts, j. a.

Plant growth regulators

By Roberts, J. A.