URLDate
Verified		Extra Software
Requirements
(if any)		Access
Conditions		Notes
http://dx.doi.org/10.1080/00103629309368907DOI Link
https://www.ars.usda.gov/ARSUserFiles/30100000/199[...]01/31/2017PDF Reader
http://www.tandfonline.com/doi/pdf/10.1080/0010362[...]Item not verifiedPDF ReaderItem is within a limited-access websiteGuide page with abstract