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http://archive.lib.msu.edu/tic/alapt/article/2017n[...]02/08/2018PDF ReaderItem is within a single large file
http://www.lawnandlandscape.com/article/best-pract[...]12/01/2017Variant title "Best practices for rotor installation: Head-to-head coverage and good installation will keep rotors efficient all season long"
http://magazine.lawnandlandscape.com/article/novem[...]12/01/2017Variant title "Best practices for rotor installation: Head-to-head coverage and good installation will keep rotors efficient all season long"