Narrow Rows Twin Rows Populations Chad Lee Grain Crops Extension, University of Kentucky Chad.
Purdue-Indiana Seed Industry Forum: Crop Production Shawn P. Conley
Peter Motavalli, Kelly Nelson, and Manjula Nathan University of Missouri
What's Cropping Up? Volume 25, Number 1 - January/February
Research and Development Farm Book
2012 Morris Sun Tribune Farm Progress Edition
Sugarbeet Grower magazine February 2011
