advisory to farmers in UK
https://cereals.ahdb.org.uk/media/185527/is02-pre-harvest-glyphosate-application-to-wheat-and-barley.pdf
Canadian advisory to their farmers
http://www1.agric.gov.ab.ca/$department/deptdocs.nsf/all/faq7206
glyphosate europe explaining how and where to use for crop prep this was in 2013 and now glyphosate has been renewed licence
http://www.glyphosate.eu/system/files/sidebox-files/pre-harvest_use_of_glyphosate_residues_in_food.pdf
article
https://ensia.com/features/glyphosate-drying/
soil association talking about issue
https://www.soilassociation.org/our-campaigns/not-in-our-bread/what-is-glyphosate/
farmers weekly trying to promote the practice
http://www.fwi.co.uk/arable/clean-up-your-weeds-ahead-of-harvest.htm