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https://gsrpdf.lib.msu.edu/?file=/article/212913-ZH.pdf11/25/2015PDF ReaderMandarin version
https://gsrpdf.lib.msu.edu/?file=/article/212913-ES.pdf11/25/2015PDF ReaderSpanish version
https://gsr.lib.msu.edu/article/gross-easing-11-16[...]11/15/2012PDF Reader
https://issuu.com/tgmdigital/docs/tgm119/807/13/2017Adobe FlashItem is within a single large file; TGM: Latinoamérica Spanish reprint; Variant pictures