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Collections Organic Roots Collection Remove constraint Organic Roots Collection: Organic Roots Collection Subjects grain crops Remove constraint grain crops: grain crops Authors USDA Remove constraint USDA: USDA

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1. Agronomic work on the Big Spring, Tex., Field Station--1915-1929

Author:: Keating, F. E. (Fred Earl), 1892 , USDA
Subject:: climatic factors , field experimentation , crop rotation , tillage , small grains , grain crops , Cropping systems -- Texas. , Tillage -- Texas. , Field experiments -- Texas.
Physical description:: 32 p.
Collection:: Organic Roots Collection
Series:: Circular
Part Of:: Circular

2. The serphoid and chalcidoid parasites of the hessian fly

Author:: Gahan, A. B. (Arthur Burton), 1880 , USDA
Subject:: parasitoids , biological control agents , host-parasite relationships , natural enemies , grain crops , insect pests , plant pests , Diptera , Hessian flies -- Parasites. , Host-parasite relationships. , Parasitic insects -- United States -- Classification.
Physical description:: 148 p.
Collection:: Organic Roots Collection
Series:: Miscellaneous publication
Part Of:: Miscellaneous publication