F. Robert Walls

Gibson, J. L., Williams, A., Whipker, B. E., Nelson, P. V., Dole, J. M., Cleveland, B., & Walls, F. R. (2007). Foliar symptomology and tissue concentrations of nutrient-deficient vegetative strawflower plants. COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS, 38(17-18), 2279–2294. https://doi.org/10.1080/00103620701588379