•  Herbicide Injury on Corn and Soybean - Purdue University
•  Herbicide Injury Symptomology - University of Missouri
•  Herbicide Injury Symptoms - University of California (Davis)
•  Peanut Herbicide Injury Symptomology Guide - Texas A&M (pdf file; 341 KB)
•  Herbicide Injury Diagnostic Key - University of Wisconsin