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Earlier versions: 2018 (v. 5.0) | 2012 (v. 4.0) 2009 (v. 3.0) | 1999 (v. 2.0) 1983 (v. 1.0)
Read about the changes to v. 4.0 (2012): Commentary GSA Bulletin Article (Walker, et al. 2013)
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