URLDate
Verified		Extra Software
Requirements
(if any)		Access
Conditions		Notes
http://sportsturfonline.com/2013/07/08/research-up[...]12/08/2015 Variant date July 8, 2013
http://sturf.lib.msu.edu/article/2013jun8b.pdf 08/01/2013 PDF Reader
https://issuu.com/tgmdigital/docs/tgm110/2806/20/2017Adobe FlashItem is within a single large file; TGM: Latinoamérica Spanish reprint; Variant pictures