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|1.1||September 8, 2014||Book published in the B.C. Open Textbook Collection.|
|1.2||August 8, 2018||Figure 1.1 replaced in Chapter 1: Introduction.||The y-axis in Figure 1.1 went up at an inconsistent rate and contained errors. The graph was recreated based on source data to fix those errors. Attribution information for this figure was also updated.|