| http://www.greenkeepingeu.com/magazines/GK_Nov-18/ | 07/03/2019 | JavaScript | | Item is within a single large file; GreenKeeping reprint; Variant title "What's beneath our feet?: What happens when you can see that there are problems with your turf but there are no obvious causes?"; Variant pictures |
| http://www.greenkeepingeu.com/whats-beneath-feet/ | 07/03/2019 | | | Item is within a single large file; GreenKeeping reprint; Variant title "What's beneath our feet?: What happens when you can see that there are problems with your turf but there are no obvious causes?"; Variant pictures |
| https://stri.lib.msu.edu/itb/articles/281.pdf | 05/15/2019 | PDF Reader | | Item is within a single large file; Direct download |
