Common Weed Seedlings of Michigan
J. Boyd Carey, James J. Kells, Karen A. Renner, Extension Bulletin E-1363, Michigan State University Extension

Identification of the weedy pigweeds and waterhemps of Iowa
Donald B. Pratt, Micheal D. K. Owen, Lynn G. Clark, Anna Gardner. Iowa State University Extension Publication Pm-1786

Pigweed Identification: A pictorial guide to the common pigweeds of the Great Plains
M. Horak, D. Peterson, D. Chessman & L. Wax. Kansas State University Publication S-80

Broadleaf and grass weed seedling identification keys
Beverly Durgan, Univ. of Minnesota Extension

Annual Broadleaf Weed Identification
Gerald R. Miller and Oliver E. Strand, North Central Regional Extension Publication 90, Univ. of Minnesota Extension Publication MI-1350-GO

Annual Broadleaf Weed Seedling Identification
Gerald R. Miller and Oliver E. Strand. North Central Regional Extension Publication 89, Univ. of Minnesota Extension Publication MI-1349-GO

Annual Grass and Perennial Weed Seedling Identification
Gerald R. Miller and Oliver E. Strand, Univ. of Minnesota Extension Publication MI-1351-GO

Annual Grass and Perennial Weed Identification
Gerald R. Miller and Oliver E. Strand, Univ. of Minnesota Extension Publication MI-1352-GO

Banvel and 2,4-D Damage to Fieldbeans and Soybeans
Robert G. Wilson & Drew J. Lyon, Nebraska Cooperative Extension NebGuide G86-802

Herbicide Mode of Action and Injury Symptoms
Jeffrey L. Gunsolus & William S. Curran, North Central Regional Extension Publication No. 377, Univ. of Minnesota Extension Publication BU-3832-GO

The Weedy Bromes: Recognizing them at an Early Stage
L. Davis, Kansas State University Publication L-814

Right Crop Stage for Herbicide Use: Corn, Sorghum, Small Grains
Drew J. Lyon, Robert G. Wilson, Jr., Alex R. Martin, University of Nebraska Cooperative Extension NebGuide.G77-382

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