Ray, 1919. Colorado Agricultural College Extension Service, Extension Bulletin Series 1. No. 158·A Document reference Ray, G. S., 1919. Sunflowers for silage. Colorado Agricultural College Extension Service, Extension Bulletin Series 1. No. 158·AWeb http://digitool.library.colostate.edu///exlibris/dtl/d3_1/apache_media/L2V4bGlic…Citation key Ray, 1919Datasheets Sunflower forage and crop residues
