?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.au=Marshall%2C+Athole+H&rft.aulast=Marshall&rft.aufirst=Athole+H&rft.date=2002&rft.title=Challenges+in+organic+forage+seed+production+&rft.genre=proceeding