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https://gsr.lib.msu.edu/article/hartwiger-ten-3-21[...]03/18/2014 PDF Reader
https://gsr.lib.msu.edu/article/hartwiger-ten-3-21[...]01/15/2015 PDF ReaderSpanish version
https://gsr.lib.msu.edu/article/hartwiger-ten-3-21[...]01/15/2015 PDF ReaderMandarin version
https://issuu.com/tgmdigital/docs/tgm12510/28/2015Adobe FlashItem is within a single large file; TGM: Latinoamérica Spanish reprint
https://archive.lib.msu.edu/tic/cespe/article/2017[...]09/05/2018PDF ReaderItem is within a single large file; Greenkeepers Spanish reprint; Variant pictures; Variant maps; Direct download